利用jdk XML 转成 xsd 再转成 javaBean

喜欢ヅ旅行 2022-05-23 09:53 206阅读 0赞

**原文地址：[攻城狮不是猫][Link 1]**

### 第一种方法 ###

首先拿到xml 例如：

通过：http://www.xmlforasp.net/CodeBank/System\_Xml\_Schema/BuildSchema/BuildXMLSchema.aspx 这个网站在线转成xsd

<?xml version="1.0" encoding="utf-16"?>
    <xsd:schema attributeFormDefault="unqualified" elementFormDefault="qualified" version="1.0" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <xsd:element name="status">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="sigar">
              <xsd:complexType>
                <xsd:attribute name="cpu" type="xsd:decimal" />
                <xsd:attribute name="memory" type="xsd:int" />
                <xsd:attribute name="jvm" type="xsd:int" />
                <xsd:attribute name="disk" type="xsd:int" />
              </xsd:complexType>
            </xsd:element>
            <xsd:element name="jvm">
              <xsd:complexType>
                <xsd:sequence>
                  <xsd:element name="memory">
                    <xsd:complexType>
                      <xsd:attribute name="free" type="xsd:int" />
                      <xsd:attribute name="total" type="xsd:int" />
                      <xsd:attribute name="max" type="xsd:int" />
                    </xsd:complexType>
                  </xsd:element>
                  <xsd:element maxOccurs="unbounded" name="memorypool">
                    <xsd:complexType>
                      <xsd:attribute name="name" type="xsd:string" />
                      <xsd:attribute name="type" type="xsd:string" />
                      <xsd:attribute name="usageInit" type="xsd:int" />
                      <xsd:attribute name="usageCommitted" type="xsd:int" />
                      <xsd:attribute name="usageMax" type="xsd:int" />
                      <xsd:attribute name="usageUsed" type="xsd:int" />
                    </xsd:complexType>
                  </xsd:element>
                </xsd:sequence>
              </xsd:complexType>
            </xsd:element>
            <xsd:element maxOccurs="unbounded" name="connector">
              <xsd:complexType>
                <xsd:sequence>
                  <xsd:element name="threadInfo">
                    <xsd:complexType>
                      <xsd:attribute name="maxThreads" type="xsd:int" />
                      <xsd:attribute name="currentThreadCount" type="xsd:int" />
                      <xsd:attribute name="currentThreadsBusy" type="xsd:int" />
                    </xsd:complexType>
                  </xsd:element>
                  <xsd:element name="requestInfo">
                    <xsd:complexType>
                      <xsd:attribute name="maxTime" type="xsd:int" />
                      <xsd:attribute name="processingTime" type="xsd:int" />
                      <xsd:attribute name="requestCount" type="xsd:int" />
                      <xsd:attribute name="errorCount" type="xsd:int" />
                      <xsd:attribute name="bytesReceived" type="xsd:int" />
                      <xsd:attribute name="bytesSent" type="xsd:int" />
                    </xsd:complexType>
                  </xsd:element>
                  <xsd:element name="workers">
                    <xsd:complexType>
                      <xsd:sequence>
                        <xsd:element name="worker">
                          <xsd:complexType>
                            <xsd:attribute name="stage" type="xsd:string" />
                            <xsd:attribute name="requestProcessingTime" type="xsd:int" />
                            <xsd:attribute name="requestBytesSent" type="xsd:int" />
                            <xsd:attribute name="requestBytesReceived" type="xsd:int" />
                            <xsd:attribute name="remoteAddr" type="xsd:string" />
                            <xsd:attribute name="virtualHost" type="xsd:string" />
                            <xsd:attribute name="method" type="xsd:string" />
                            <xsd:attribute name="currentUri" type="xsd:string" />
                            <xsd:attribute name="currentQueryString" type="xsd:string" />
                            <xsd:attribute name="protocol" type="xsd:string" />
                          </xsd:complexType>
                        </xsd:element>
                      </xsd:sequence>
                    </xsd:complexType>
                  </xsd:element>
                </xsd:sequence>
                <xsd:attribute name="name" type="xsd:string" />
              </xsd:complexType>
            </xsd:element>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>
    </xsd:schema>

新增文件保存为 test.xsd 编码utf-16 改成utf-8

cmd 进入到文件下执行：

xjc test.xsd -p test.java

然后就可以看到生成的文件了，  就是这么的简单；

### 第二种方法 ###

Jaxb

JAXB官网：[http://jaxb.java.net/][http_jaxb.java.net]

API链接 ：[http://jaxb.java.net/nonav/2.2.5/docs/api/][http_jaxb.java.net_nonav_2.2.5_docs_api]

文档    ：[http://jaxb.java.net/tutorial/  ][http_jaxb.java.net_tutorial]

1. 利用trang.jar将Xml 转换成xsd

Trang 是一种命令行的可以XML生成XSD的工具，生成XML文件对应的XSD文件只需要3个简单的步骤：

第一步  下载Trang

从[http://www.thaiopensource.com/relaxng/trang.html 上下载trang-version.zip][http_www.thaiopensource.com_relaxng_trang.html_trang-version.zip]

利用trang 生成xsd后， 之后的 动作跟上面一样；

读取xml字符串转成javabean （XXX） 为上面转换的javabean

Reader reader = new StringReader(reqXmlStr);  
            Unmarshaller unmarshaller = JAXBContext.newInstance(XXX.class).createUnmarshaller();  
            root = (XXX) unmarshaller.unmarshal(reader);

[Link 1]: http://www.jsdblog.com/article/115
[http_jaxb.java.net]: http://jaxb.java.net/
[http_jaxb.java.net_nonav_2.2.5_docs_api]: http://jaxb.java.net/nonav/2.2.5/docs/api/
[http_jaxb.java.net_tutorial]: http://jaxb.java.net/tutorial/
[http_www.thaiopensource.com_relaxng_trang.html_trang-version.zip]: http://www.thaiopensource.com/relaxng/trang.html%C2%A0%E4%B8%8A%E4%B8%8B%E8%BD%BDtrang-version.zip