JSON-lib框架，转换JSON、XML不再困难

一时失言乱红尘 2022-08-27 15:47 274阅读 0赞

JSON-lib框架，转换JSON、XML不再困难

Json-lib可以将Java对象转成json格式的字符串，也可以将Java对象转换成xml格式的文档，同样可以将json字符串转换成Java对象或是将xml字符串转换成Java对象。

一、 准备工作

1、 首先要去官方下载json-lib工具包

下载地址：

http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-2.4/

目前最新的是2.4的版本，本示例中使用的是v2.3；json-lib还需要以下依赖包：

jakarta commons-lang 2.5

jakarta commons-beanutils 1.8.0

jakarta commons-collections 3.2.1

jakarta commons-logging 1.1.1

ezmorph 1.0.6

官方网址：http://json-lib.sourceforge.net/

然后在工程中添加如下jar包：

clip\_image002

当然你也可以用2.4的json-lib库

你可以在这里看看官方提供的示例：

http://json-lib.sourceforge.net/usage.html

由于本次介绍的示例需要junit工具，所以你还需要添加junit的jar文件，版本是4.8.2版本的，下载地址：https://github.com/KentBeck/junit/downloads

如果你还不了解JSON是什么？那么你应该可以看看http://www.json.org/json-zh.html

2、 要转换的JavaBean的代码如下：

  1. package com.hoo.entity;
  3. public class Student {
  5. private int id;
  7. private String name;
  9. private String email;
  11. private String address;
  13. private Birthday birthday;
  15. //setter、getter
  17. public String toString() {
  19. return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email;
  21. }
  23. }

Birthday.java

  1. package com.hoo.entity;
  3. public class Birthday {
  5. private String birthday;
  7. public Birthday(String birthday) {
  9. super();
  11. this.birthday = birthday;
  13. }
  15. //setter、getter
  17. public Birthday() {}
  19. @Override
  21. public String toString() {
  23. return this.birthday;
  25. }
  27. }

注意，上面的getter、setter方法省略了，自己构建下。

3、 新建JsonlibTest测试类，基本代码如下：

  1. package com.hoo.test;
  3. import java.lang.reflect.InvocationTargetException;
  5. import java.util.ArrayList;
  7. import java.util.Collection;
  9. import java.util.Date;
  11. import java.util.HashMap;
  13. import java.util.Iterator;
  15. import java.util.List;
  17. import java.util.Map;
  19. import java.util.Set;
  21. import net.sf.json.JSON;
  23. import net.sf.json.JSONArray;
  25. import net.sf.json.JSONFunction;
  27. import net.sf.json.JSONObject;
  29. import net.sf.json.JSONSerializer;
  31. import net.sf.json.JsonConfig;
  33. import net.sf.json.processors.JsonValueProcessor;
  35. import net.sf.json.util.PropertyFilter;
  37. import net.sf.json.xml.XMLSerializer;
  39. import org.apache.commons.beanutils.PropertyUtils;
  41. import org.junit.After;
  43. import org.junit.Before;
  45. import org.junit.Test;
  47. import com.hoo.entity.Birthday;
  49. import com.hoo.entity.Student;
  51. /**
  53. * <b>function:</b> 用json-lib转换java对象到JSON字符串
  55. * 读取json字符串到java对象，序列化jsonObject到xml
  57. * json-lib-version: json-lib-2.3-jdk15.jar
  59. * 依赖包:
  61. * commons-beanutils.jar
  63. * commons-collections-3.2.jar
  65. * ezmorph-1.0.3.jar
  67. * commons-lang.jar
  69. * commons-logging.jar
  71. * @author hoojo
  73. * @createDate Nov 28, 2010 2:28:39 PM
  75. * @file JsonlibTest.java
  77. * @package com.hoo.test
  79. * @project WebHttpUtils
  81. * @blog http://blog.csdn.net/IBM_hoojo
  83. * @email hoojo_@126.com
  85. * @version 1.0
  87. */
  89. @SuppressWarnings({ "deprecation", "unchecked" })
  91. public class JsonlibTest {
  93. private JSONArray jsonArray = null;
  95. private JSONObject jsonObject = null;
  97. private Student bean = null;
  99. @Before
  101. public void init() {
  103. jsonArray = new JSONArray();
  105. jsonObject = new JSONObject();
  107. bean = new Student();
  109. bean.setAddress("address");
  111. bean.setEmail("email");
  113. bean.setId(1);
  115. bean.setName("haha");
  117. Birthday day = new Birthday();
  119. day.setBirthday("2010-11-22");
  121. bean.setBirthday(day);
  123. }
  125. @After
  127. public void destory() {
  129. jsonArray = null;
  131. jsonObject = null;
  133. bean = null;
  135. System.gc();
  137. }
  139. public final void fail(String string) {
  141. System.out.println(string);
  143. }
  145. public final void failRed(String string) {
  147. System.err.println(string);
  149. }
  151. }

上面的init会在每个方法之前运行，destory会在每个方法完成后执行。分别用到了junit的@Before、@After注解，如果你对junit的这些注解不是很了解，可以看看junit官方的测试用例的example和doc；

JSONObject是将Java对象转换成一个json的Object形式，JSONArray是将一个Java对象转换成json的Array格式。

那什么是json的Object形式、Array形式？

用通俗易懂的方法将，所谓的json的Object形式就是一个花括号里面存放的如JavaMap的键值对，如：{name:’hoojo’, age: 24}；

那么json的Array形式呢？

就是中括号，括起来的数组。如：[ ‘json’, true, 22]；

如果你还想了解更多json方面的知识，请看：http://www.json.org/json-zh.html

除了上面的JSONArray、JSONObject可以将Java对象转换成JSON或是相反，将JSON字符串转换成Java对象，还有一个对象也可以完成上面的功能，它就是JSONSerializer；下面我们就来看看它们是怎么玩转Java对象和JSON的。

二、 Java对象序列化成JSON对象

1、 将JavaObject转换吃JSON字符串

在JsonlibTest中添加如下代码：

  1. /*=========================Java Object >>>> JSON String ===========================*/
  3. /**
  5. * <b>function:</b>转Java Bean对象到JSON
  7. * @author hoojo
  9. * @createDate Nov 28, 2010 2:35:54 PM
  11. */
  13. @Test
  15. public void writeEntity2JSON() {
  17. fail("==============Java Bean >>> JSON Object==================");
  19. fail(JSONObject.fromObject(bean).toString());
  21. fail("==============Java Bean >>> JSON Array==================");
  23. fail(JSONArray.fromObject(bean).toString());//array会在最外层套上[]
  25. fail("==============Java Bean >>> JSON Object ==================");
  27. fail(JSONSerializer.toJSON(bean).toString());
  29. fail("========================JsonConfig========================");
  31. JsonConfig jsonConfig = new JsonConfig();
  33. jsonConfig.registerJsonValueProcessor(Birthday.class, new JsonValueProcessor() {
  35. public Object processArrayValue(Object value, JsonConfig jsonConfig) {
  37. if (value == null) {
  39. return new Date();
  41. }
  43. return value;
  45. }
  47. public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {
  49. fail("key:" + key);
  51. return value + "##修改过的日期";
  53. }
  55. });
  57. jsonObject = JSONObject.fromObject(bean, jsonConfig);
  59. fail(jsonObject.toString());
  61. Student student = (Student) JSONObject.toBean(jsonObject, Student.class);
  63. fail(jsonObject.getString("birthday"));
  65. fail(student.toString());
  67. fail("#####################JsonPropertyFilter############################");
  69. jsonConfig.setJsonPropertyFilter(new PropertyFilter() {
  71. public boolean apply(Object source, String name, Object value) {
  73. fail(source + "%%%" + name + "--" + value);
  75. //忽略birthday属性
  77. if (value != null && Birthday.class.isAssignableFrom(value.getClass())) {
  79. return true;
  81. }
  83. return false;
  85. }
  87. });
  89. fail(JSONObject.fromObject(bean, jsonConfig).toString());
  91. fail("#################JavaPropertyFilter##################");
  93. jsonConfig.setRootClass(Student.class);
  95. jsonConfig.setJavaPropertyFilter(new PropertyFilter() {
  97. public boolean apply(Object source, String name, Object value) {
  99. fail(name + "@" + value + "#" + source);
  101. if ("id".equals(name) || "email".equals(name)) {
  103. value = name + "@@";
  105. return true;
  107. }
  109. return false;
  111. }
  113. });
  115. //jsonObject = JSONObject.fromObject(bean, jsonConfig);
  117. //student = (Student) JSONObject.toBean(jsonObject, Student.class);
  119. //fail(student.toString());
  121. student = (Student) JSONObject.toBean(jsonObject, jsonConfig);
  123. fail("Student:" + student.toString());
  125. }

fromObject将Java对象转换成json字符串，toBean将json对象转换成Java对象；

上面方法值得注意的是使用了JsonConfig这个对象，这个对象可以在序列化的时候对JavaObject的数据进行处理、过滤等

上面的jsonConfig的registerJsonValueProcessor方法可以完成对象值的处理和修改，比如处理生日为null时，给一个特定的值。同样setJsonPropertyFilter和setJavaPropertyFilter都是完成对转换后的值的处理。

运行上面的代码可以在控制台看到如下结果：

  1. ==============Java Bean >>> JSON Object==================
  3. {
  4.      "address":"address","birthday":{
  5.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}
  7. ==============Java Bean >>> JSON Array==================
  9. [{
  10.      "address":"address","birthday":{
  11.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}]
  13. ==============Java Bean >>> JSON Object ==================
  15. {
  16.      "address":"address","birthday":{
  17.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"haha"}
  19. ========================JsonConfig========================
  21. key:birthday
  23. {
  24.      "address":"address","birthday":"2010-11-22##修改过的日期","email":"email","id":1,"name":"haha"}
  26. 2010-11-22##修改过的日期
  28. haha#1#address#null#email
  30. #####################JsonPropertyFilter############################
  32. haha#1#address#2010-11-22#email%%%address--address
  34. haha#1#address#2010-11-22#email%%%birthday--2010-11-22
  36. haha#1#address#2010-11-22#email%%%email--email
  38. haha#1#address#2010-11-22#email%%%id--1
  40. haha#1#address#2010-11-22#email%%%name--haha
  42. {
  43.      "address":"address","email":"email","id":1,"name":"haha"}
  45. #################JavaPropertyFilter##################
  47. address@address#null#0#null#null#null
  49. birthday@2010-11-22##修改过的日期#null#0#address#null#null
  51. email@email#null#0#address#null#null
  53. id@1#null#0#address#null#null
  55. name@haha#null#0#address#null#null
  57. Student:haha#0#address#null#null

2、 将JavaList集合转换吃JSON字符串

  1. /**
  3. * <b>function:</b>转换Java List集合到JSON
  5. * @author hoojo
  7. * @createDate Nov 28, 2010 2:36:15 PM
  9. */
  11. @Test
  13. public void writeList2JSON() {
  15. fail("==============Java List >>> JSON Array==================");
  17. List<Student> stu = new ArrayList<Student>();
  19. stu.add(bean);
  21. bean.setName("jack");
  23. stu.add(bean);
  25. fail(JSONArray.fromObject(stu).toString());
  27. fail(JSONSerializer.toJSON(stu).toString());
  29. }

运行此方法后，可以看到控制台输出：

  1. ==============Java List >>> JSON Array==================
  3. [{
  4.      "address":"address","birthday":{
  5.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},
  7. {
  8.      "address":"address","birthday":{
  9.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"}]
  11. [{
  12.      "address":"address","birthday":{
  13.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},
  15. {
  16.      "address":"address","birthday":{
  17.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"}]

如果你是转换List集合，一定得用JSONArray或是JSONSrializer提供的序列化方法。如果你用JSONObject.fromObject方法转换List会出现异常，通常使用JSONSrializer这个JSON序列化的方法，它会自动识别你传递的对象的类型，然后转换成相应的JSON字符串。

3、 将Map集合转换成JSON对象

  1. /**
  3. * <b>function:</b>转Java Map对象到JSON
  5. * @author hoojo
  7. * @createDate Nov 28, 2010 2:37:35 PM
  9. */
  11. @Test
  13. public void writeMap2JSON() {
  15. Map<String, Object> map = new HashMap<String, Object>();
  17. map.put("A", bean);
  19. bean.setName("jack");
  21. map.put("B", bean);
  23. map.put("name", "json");
  25. map.put("bool", Boolean.TRUE);
  27. map.put("int", new Integer(1));
  29. map.put("arr", new String[] { "a", "b" });
  31. map.put("func", "function(i){ return this.arr[i]; }");
  33. fail("==============Java Map >>> JSON Object==================");
  35. fail(JSONObject.fromObject(map).toString());
  37. fail("==============Java Map >>> JSON Array ==================");
  39. fail(JSONArray.fromObject(map).toString());
  41. fail("==============Java Map >>> JSON Object==================");
  43. fail(JSONSerializer.toJSON(map).toString());
  45. }

上面的Map集合有JavaBean、String、Boolean、Integer、以及Array和js的function函数的字符串。

运行上面的程序，结果如下：

  1. ==============Java Map >>> JSON Object==================
  3. {
  4.      "arr":["a","b"],"A":{
  5.      "address":"address","birthday":{
  6.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,
  8. "B":{
  9.      "address":"address","birthday":{
  10.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",
  12. "func":function(i){ return this.arr[i]; },"bool":true}
  14. ==============Java Map >>> JSON Array ==================
  16. [{
  17.      "arr":["a","b"],"A":{
  18.      "address":"address","birthday":{
  19.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,
  21. "B":{
  22.      "address":"address","birthday":{
  23.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",
  25. "func":function(i){ return this.arr[i]; },"bool":true}]
  27. ==============Java Map >>> JSON Object==================
  29. {
  30.      "arr":["a","b"],"A":{
  31.      "address":"address","birthday":{
  32.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"int":1,
  34. "B":{
  35.      "address":"address","birthday":{
  36.      "birthday":"2010-11-22"},"email":"email","id":1,"name":"jack"},"name":"json",
  38. "func":function(i){ return this.arr[i]; },"bool":true}

4、 将更多类型转换成JSON

  1. /**
  3. * <b>function:</b>  转换更多数组类型到JSON
  5. * @author hoojo
  7. * @createDate Nov 28, 2010 2:39:19 PM
  9. */
  11. @Test
  13. public void writeObject2JSON() {
  15. String[] sa = {
  16.      "a", "b", "c"};
  18. fail("==============Java StringArray >>> JSON Array ==================");
  20. fail(JSONArray.fromObject(sa).toString());
  22. fail(JSONSerializer.toJSON(sa).toString());
  24. fail("==============Java boolean Array >>> JSON Array ==================");
  26. boolean[] bo = { true, false, true };
  28. fail(JSONArray.fromObject(bo).toString());
  30. fail(JSONSerializer.toJSON(bo).toString());
  32. Object[] o = { 1, "a", true, 'A', sa, bo };
  34. fail("==============Java Object Array >>> JSON Array ==================");
  36. fail(JSONArray.fromObject(o).toString());
  38. fail(JSONSerializer.toJSON(o).toString());
  40. fail("==============Java String >>> JSON ==================");
  42. fail(JSONArray.fromObject("['json','is','easy']").toString());
  44. fail(JSONObject.fromObject("{'json':'is easy'}").toString());
  46. fail(JSONSerializer.toJSON("['json','is','easy']").toString());
  48. fail("==============Java JSONObject >>> JSON ==================");
  50. jsonObject = new JSONObject()
  52. .element("string", "JSON")
  54. .element("integer", "1")
  56. .element("double", "2.0")
  58. .element("boolean", "true");
  60. fail(JSONSerializer.toJSON(jsonObject).toString());
  62. fail("==============Java JSONArray >>> JSON ==================");
  64. jsonArray = new JSONArray()
  66. .element( "JSON" )
  68. .element( "1" )
  70. .element( "2.0" )
  72. .element( "true" );
  74. fail(JSONSerializer.toJSON(jsonArray).toString());
  76. fail("==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================");
  78. List input = new ArrayList();
  80. input.add("JSON");
  82. input.add("1");
  84. input.add("2.0");
  86. input.add("true");
  88. JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input );
  90. JsonConfig jsonConfig = new JsonConfig();
  92. jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY );
  94. Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig);
  96. System.out.println(output[0]);
  98. fail("==============Java JSONFunction >>> JSON ==================");
  100. String str = "{'func': function( param ){ doSomethingWithParam(param); }}";
  102. JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(str);
  104. JSONFunction func = (JSONFunction) jsonObject.get("func");
  106. fail(func.getParams()[0]);
  108. fail(func.getText() );
  110. }

运行后结果如下：

  1. ==============Java StringArray >>> JSON Array ==================
  3. ["a","b","c"]
  5. ["a","b","c"]
  7. ==============Java boolean Array >>> JSON Array ==================
  9. [true,false,true]
  11. [true,false,true]
  13. ==============Java Object Array >>> JSON Array ==================
  15. [1,"a",true,"A",["a","b","c"],[true,false,true]]
  17. [1,"a",true,"A",["a","b","c"],[true,false,true]]
  19. ==============Java String >>> JSON ==================
  21. ["json","is","easy"]
  23. {
  24.      "json":"is easy"}
  26. ["json","is","easy"]
  28. ==============Java JSONObject >>> JSON ==================
  30. {
  31.      "string":"JSON","integer":"1","double":"2.0","boolean":"true"}
  33. ==============Java JSONArray >>> JSON ==================
  35. ["JSON","1","2.0","true"]
  37. ==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================
  39. JSON
  41. ==============Java JSONFunction >>> JSON ==================
  43. param
  45. doSomethingWithParam(param);

这里还有一个JSONFunction的对象，可以转换JavaScript的function。可以获取方法参数和方法体。同时，还可以用JSONObject、JSONArray构建Java对象，完成Java对象到JSON字符串的转换。

三、 JSON对象反序列化成Java对象

1、 将json字符串转成Java对象

  1. private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
  3. "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
  5. /**
  7. * <b>function:</b>将json字符串转化为java对象
  9. * @author hoojo
  11. * @createDate Nov 28, 2010 3:01:16 PM
  13. */
  15. @Test
  17. public void readJSON2Bean() {
  19. fail("==============JSON Object String >>> Java Bean ==================");
  21. jsonObject = JSONObject.fromObject(json);
  23. Student stu = (Student) JSONObject.toBean(jsonObject, Student.class);
  25. fail(stu.toString());
  27. }

运行后，结果如下：

  1. ==============JSON Object String >>> Java Bean ==================
  3. tom#22#chian#2010-11-22#email@123.com

2、 将json字符串转换成动态Java对象(MorphDynaBean)

  1. private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
  3. "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
  5. @Test
  7. public void readJSON2DynaBean() {
  9. try {
  11. fail("==============JSON Object String >>> Java MorphDynaBean ==================");
  13. JSON jo = JSONSerializer.toJSON(json);
  15. Object o = JSONSerializer.toJava(jo);//MorphDynaBean
  17. fail(PropertyUtils.getProperty(o, "address").toString());
  19. jsonObject = JSONObject.fromObject(json);
  21. fail(jsonObject.getString("email"));
  23. o = JSONSerializer.toJava(jsonObject);//MorphDynaBean
  25. fail(PropertyUtils.getProperty(o, "name").toString());
  27. } catch (IllegalAccessException e) {
  29. e.printStackTrace();
  31. } catch (InvocationTargetException e) {
  33. e.printStackTrace();
  35. } catch (NoSuchMethodException e) {
  37. e.printStackTrace();
  39. }
  41. }

转换后的对象Object是一个MorphDynaBean的动态JavaBean，通过PropertyUtils可以获得指定的属性的值。

运行后结果如下：

  1. ==============JSON Object String >>> Java MorphDynaBean =============
  3. chian
  5. email@123.com
  7. tom

3、 将json字符串转成Java的Array数组

  1. private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
  3. "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
  5. @Test
  7. public void readJSON2Array() {
  9. try {
  11. fail("==============JSON Arry String >>> Java Array ==================");
  13. json = "[" + json + "]";
  15. jsonArray = JSONArray.fromObject(json);
  17. fail("#%%%" + jsonArray.get(0).toString());
  19. Object[] os = jsonArray.toArray();
  21. System.out.println(os.length);
  23. fail(JSONArray.fromObject(json).join(""));
  25. fail(os[0].toString());
  27. Student[] stus = (Student[]) JSONArray.toArray(jsonArray, Student.class);
  29. System.out.println(stus.length);
  31. System.out.println(stus[0]);
  33. } catch (Exception e) {
  35. e.printStackTrace();
  37. }
  39. }

运行的结果如下：

  1. ==============JSON Arry String >>> Java Array ==================
  3. #%%%{
  4.      "address":"chian","birthday":{
  5.      "birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}
  7. 1
  9. {
  10.      "address":"chian","birthday":{
  11.      "birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}
  13. {
  14.      "address":"chian","birthday":{
  15.      "birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}
  17. 1
  19. tom#22#chian#2010-11-22#email@123.com

4、 将JSON字符串转成Java的List集合

  1. private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
  3. "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
  5. @Test
  7. public void readJSON2List() {
  9. try {
  11. fail("==============JSON Arry String >>> Java List ==================");
  13. json = "[" + json + "]";
  15. jsonArray = JSONArray.fromObject(json);
  17. List<Student> list = JSONArray.toList(jsonArray, Student.class);
  19. System.out.println(list.size());
  21. System.out.println(list.get(0));
  23. list = JSONArray.toList(jsonArray);
  25. System.out.println(list.size());
  27. System.out.println(list.get(0));//MorphDynaBean
  29. } catch (Exception e) {
  31. e.printStackTrace();
  33. }
  35. }

运行后结果如下：

  1. ==============JSON Arry String >>> Java List ==================
  3. 1
  5. tom#22#chian#2010-11-22#email@123.com
  7. 1
  9. net.sf.ezmorph.bean.MorphDynaBean@141b571[
  11. {id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[
  13. {birthday=2010-11-22}
  15. ], address=chian, email=email@123.com, name=tom}
  17. ]

5、 将json字符串转换成Collection接口

  1. private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
  3. "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
  5. @Test
  7. public void readJSON2Collection() {
  9. try {
  11. fail("==============JSON Arry String >>> Java Collection ==================");
  13. json = "[" + json + "]";
  15. jsonArray = JSONArray.fromObject(json);
  17. Collection<Student> con = JSONArray.toCollection(jsonArray, Student.class);
  19. System.out.println(con.size());
  21. Object[] stt = con.toArray();
  23. System.out.println(stt.length);
  25. fail(stt[0].toString());
  27. } catch (Exception e) {
  29. e.printStackTrace();
  31. }
  33. }

刚才上面的将json转换成list提示该方法过时，这里有toCollection，可以用此方法代替toList方法；运行后结果如下：

  1. ==============JSON Arry String >>> Java Collection ==================
  3. 1
  5. 1
  7. tom#22#chian#2010-11-22#email@123.com

6、 将json字符串转换成Map集合

  1. @Test
  3. public void readJSON2Map() {
  5. try {
  7. fail("==============JSON Arry String >>> Java Map ==================");
  9. json = "{\"arr\":[\"a\",\"b\"],\"A\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
  11. "\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"int\":1,"+
  13. "\"B\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
  15. "\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"name\":\"json\",\"bool\":true}";
  17. jsonObject = JSONObject.fromObject(json);
  19. Map<String, Class<?>> clazzMap = new HashMap<String, Class<?>>();
  21. clazzMap.put("arr", String[].class);
  23. clazzMap.put("A", Student.class);
  25. clazzMap.put("B", Student.class);
  27. Map<String, ?> mapBean = (Map) JSONObject.toBean(jsonObject, Map.class, clazzMap);
  29. System.out.println(mapBean);
  31. Set<String> set = mapBean.keySet();
  33. Iterator<String> iter = set.iterator();
  35. while (iter.hasNext()) {
  37. String key = iter.next();
  39. fail(key + ":" + mapBean.get(key).toString());
  41. }
  43. } catch (Exception e) {
  45. e.printStackTrace();
  47. }
  49. }

运行后结果如下：

  1. ==============JSON Arry String >>> Java Map ==================
  3. {A=jack#1#address#2010-11-22#email, arr=[a, b], B=jack#1#address#2010-11-22#email, int=1, name=json, bool=true}
  5. A:jack#1#address#2010-11-22#email
  7. arr:[a, b]
  9. B:jack#1#address#2010-11-22#email
  11. int:1
  13. name:json
  15. bool:true

四、 JSON-lib对XML的支持

1、 将Java对象到XML

  1. /*============================Java Object >>>>> XML ==========================*/
  3. /**
  5. * <b>function:</b> 转换Java对象到XML
  7. * 需要额外的jar包：xom.jar
  9. * @author hoojo
  11. * @createDate Nov 28, 2010 2:39:55 PM
  13. */
  15. @Test
  17. public void writeObject2XML() {
  19. XMLSerializer xmlSerializer = new XMLSerializer();
  21. fail("==============Java String Array >>> XML ==================");
  23. //xmlSerializer.setElementName("bean");
  25. fail(xmlSerializer.write(JSONArray.fromObject(bean)));
  27. String[] sa = {
  28.      "a", "b", "c"};
  30. fail("==============Java String Array >>> XML ==================");
  32. fail(xmlSerializer.write(JSONArray.fromObject(sa)));
  34. fail("==============Java boolean Array >>> XML ==================");
  36. boolean[] bo = { true, false, true };
  38. fail(xmlSerializer.write(JSONArray.fromObject(bo)));
  40. fail(xmlSerializer.write(JSONSerializer.toJSON(bo)));
  42. Object[] o = { 1, "a", true, 'A', sa, bo };
  44. fail("==============Java Object Array >>> JSON Array ==================");
  46. fail(xmlSerializer.write(JSONArray.fromObject(o)));
  48. fail(xmlSerializer.write(JSONSerializer.toJSON(o)));
  50. fail("==============Java String >>> JSON ==================");
  52. fail(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']")).toString());
  54. fail(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}")).toString());
  56. fail(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']")).toString());
  58. }

主要运用的是XMLSerializer的write方法，这个方法可以完成java对象到xml的转换，不过你很容易就可以看到这个xml序列化对象，需要先将java对象转成json对象，然后再将json转换吃xml文档。

运行后结果如下：

  1. ==============Java String Array >>> XML ==================
  3. <?xml version="1.0" encoding="UTF-8"?>
  5. <a><e class="object">
  7. <address type="string">address</address><birthday class="object"><birthday type="string">2010-11-22</birthday></birthday>
  9. <email type="string">email</email><id type="number">1</id><name type="string">haha</name>
  11. </e></a>
  13. ==============Java String Array >>> XML ==================
  15. <?xml version="1.0" encoding="UTF-8"?>
  17. <a><e type="string">a</e><e type="string">b</e><e type="string">c</e></a>
  19. ==============Java boolean Array >>> XML ==================
  21. <?xml version="1.0" encoding="UTF-8"?>
  23. <a><e type="boolean">true</e><e type="boolean">false</e><e type="boolean">true</e></a>
  25. <?xml version="1.0" encoding="UTF-8"?>
  27. <a><e type="boolean">true</e><e type="boolean">false</e><e type="boolean">true</e></a>
  29. ==============Java Object Array >>> JSON Array ==================
  31. <?xml version="1.0" encoding="UTF-8"?>
  33. <a><e type="number">1</e><e type="string">a</e><e type="boolean">true</e><e type="string">A</e><e class="array">
  35. <e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e class="array"><e type="boolean">true</e>
  37. <e type="boolean">false</e><e type="boolean">true</e></e></a>
  39. <?xml version="1.0" encoding="UTF-8"?>
  41. <a><e type="number">1</e><e type="string">a</e><e type="boolean">true</e><e type="string">A</e><e class="array">
  43. <e type="string">a</e><e type="string">b</e><e type="string">c</e></e><e class="array"><e type="boolean">true</e>
  45. <e type="boolean">false</e><e type="boolean">true</e></e></a>
  47. ==============Java String >>> JSON ==================
  49. <?xml version="1.0" encoding="UTF-8"?>
  51. <a><e type="string">json</e><e type="string">is</e><e type="string">easy</e></a>
  53. <?xml version="1.0" encoding="UTF-8"?>
  55. <o><json type="string">is easy</json></o>
  57. <?xml version="1.0" encoding="UTF-8"?>
  59. <a><e type="string">json</e><e type="string">is</e><e type="string">easy</e></a>

上面的节点名称有点乱，你可以通过setElementName设置节点名称

2、 将XML转换成Java对象

  1. /*============================XML String >>>>> Java Object ==========================*/
  3. /**
  5. * <b>function:</b>转换xml文档到java对象
  7. * @author hoojo
  9. * @createDate Nov 28, 2010 3:00:27 PM
  11. */
  13. @Test
  15. public void readXML2Object() {
  17. XMLSerializer xmlSerializer = new XMLSerializer();
  19. fail("============== XML >>>> Java String Array ==================");
  21. String[] sa = {
  22.      "a", "b", "c"};
  24. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(sa)));
  26. fail(jsonArray.toString());
  28. String[] s = (String[]) JSONArray.toArray(jsonArray, String.class);
  30. fail(s[0].toString());
  32. fail("============== XML >>>> Java boolean Array ==================");
  34. boolean[] bo = { true, false, true };
  36. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(bo)));
  38. bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);
  40. fail(bo.toString());
  42. System.out.println(bo[0]);
  44. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(bo)));
  46. bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);
  48. fail(bo.toString());
  50. System.out.println(bo[0]);
  52. fail("==============Java Object Array >>> JSON Array ==================");
  54. Object[] o = { 1, "a", true, 'A', sa, bo };
  56. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(o)));
  58. System.out.println(jsonArray.getInt(0));
  60. System.out.println(jsonArray.get(1));
  62. System.out.println(jsonArray.getBoolean(2));
  64. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(o)));
  66. System.out.println(jsonArray.get(4));
  68. System.out.println(jsonArray.getJSONArray(5).get(0));
  70. System.out.println(jsonArray.get(5));
  72. fail("==============Java String >>> JSON ==================");
  74. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject("['json','is','easy']")).toString());
  76. s = (String[]) JSONArray.toArray(jsonArray, String.class);
  78. fail(s[0].toString());
  80. jsonObject = (JSONObject) xmlSerializer.read(xmlSerializer.write(JSONObject.fromObject("{'json':'is easy'}")).toString());
  82. Object obj = JSONObject.toBean(jsonObject);
  84. System.out.println(obj);
  86. jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON("['json','is','easy']")).toString());
  88. s = (String[]) JSONArray.toArray(jsonArray, String.class);
  90. fail(s[1].toString());
  92. }

主要运用到XMLSerializer的read方法，将xml内容读取后，转换成Java对象。运行后结果如下：

  1. ============== XML >>>> Java String Array ==================
  3. ["a","b","c"]
  5. a
  7. ============== XML >>>> Java boolean Array ==================
  9. [Z@15856a5
  11. true
  13. [Z@79ed7f
  15. true
  17. ==============Java Object Array >>> JSON Array ==================
  19. 1
  21. a
  23. true
  25. ["a","b","c"]
  27. true
  29. ["true","false","true"]
  31. ==============Java String >>> JSON ==================
  33. json
  35. net.sf.ezmorph.bean.MorphDynaBean@c09554[
  37. {json=is easy}
  39. ]
  41. is

3、 将xml的字符串内容，转换成Java的Array对象

  1. @Test
  3. public void testReadXml2Array() {
  5. String str = "<a class=\"array\">" +
  7. "<e type=\"function\" params=\"i,j\">" +
  9. "return matrix[i][j];" +
  11. "</e>" +
  13. "</a>";
  15. JSONArray json = (JSONArray) new XMLSerializer().read(str);
  17. fail(json.toString());
  19. }

上面是一段xml字符串格式的文档，将其转换为JSONArray对象。转换后结果如下：

  1. [function(i,j){ return matrix[i][j]; }]

就是一个数组；

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