SAX 解析XML 将xml转换成javaBean

雨点打透心脏的1/2处 2022-09-24 05:18 217阅读 0赞

SAX没有提供，直接将xml转成自定义javaBean的方法。

自己写了一个工具类通过反射机制转换。可以支持多数组。

/**
     * Created by tiantao on 16-7-20.
     */
    public class SaxUtil {
    
        private static final Logger logger = LoggerFactory.getLogger(SaxUtil.class);
    
        public static RequestBean converyRequestBean(String xml) {
    
            RequestBean requestBean = new RequestBean();
            try {
                SAXBuilder sb = new SAXBuilder();
                StringReader read = new StringReader(xml);
                InputSource source = new InputSource(read);
                Document doc = sb.build(source);
                Element root = doc.getRootElement();
    
                recursionConvery(root, RequestBean.class, requestBean);
            } catch (Exception e) {
                logger.error(e.toString(),e);
                return null;
            }
            return requestBean;
        }
    
        private static void recursionConvery(Element e, Class<?> clazz, Object o) throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchMethodException {
            List<Element> el = e.getChildren();
            if (el.size() > 0) {
                for (Element element : el) {
                    String childClassName = element.getName();
                    String getMethodName = "get" + childClassName.substring(0, 1).toUpperCase() + childClassName.substring(1);
                    String setMethodName = "set" + childClassName.substring(0, 1).toUpperCase() + childClassName.substring(1);
    
                    //当属性名为Class或class时，特殊处理get方法写成getclass
                    if ("getClass".equals(getMethodName)) {
                        getMethodName = "getclass";
                    }
    
                    Class<?> clazz1 = null;
                    Method[] ms = clazz.getMethods();
                    for (Method m : ms) {
                        if (getMethodName.equals(m.getName())) {
                            clazz1 = m.getReturnType();
                            if (clazz1.isArray()) {
                                int arraySize = 0;
                                for (Element element1 : el) {
                                    if (element1.getName().equals(clazz1.getComponentType().getSimpleName())) {
                                        arraySize++;
                                    }
                                }
                                Object arrayObjects = Array.newInstance(clazz1.getComponentType(), arraySize);
                                int n = 0;
                                for (Element element1 : el) {
                                    if (element1.getName().equals(clazz1.getComponentType().getSimpleName())) {
                                        Object oneO = clazz1.getComponentType().newInstance();
                                        recursionConvery(element1, clazz1.getComponentType(), oneO);
                                        Array.set(arrayObjects, n, oneO);
                                        n++;
                                    }
                                }
                                Method setMethod = clazz.getMethod(setMethodName, clazz1);
                                setMethod.invoke(o, arrayObjects);
                            } else {
                                if (element.getChildren() != null && element.getChildren().size() > 0) {
                                    Object o1 = clazz1.newInstance();
                                    recursionConvery(element, clazz1, o1);
                                    Method setMethod = clazz.getMethod(setMethodName, clazz1);
                                    setMethod.invoke(o, o1);
                                } else {
                                    Method setMethod = clazz.getMethod(setMethodName, clazz1);
                                    setValue(element, setMethod, o);
                                }
                            }
                        }
                    }
                }
            }
        }
    
    
        private static void setValue(Element element, Method method, Object o) throws InvocationTargetException, IllegalAccessException {
            Class<?>[] c = method.getParameterTypes();
            Object v = null;
            if (element.getContentSize() > 0){
                String text = element.getTextTrim();
    
                String cn = c[0].getSimpleName();
    
                if ("int".equals(cn) || "Integer".equals(cn)) {
                    v = Integer.parseInt(text);
                } else if ("long".equals(cn) || "Long".equals(cn)) {
                    v = Long.parseLong(text);
                } else if ("double".equals(cn) || "Double".equals(cn)) {
                    v = Double.parseDouble(text);
                } else if ("float".equals(cn) || "Float".equals(cn)) {
                    v = Float.parseFloat(text);
                } else {
                    v = text;
                }
            }
            method.invoke(o, v);
    
        }
    
    }

代码需要一些其他类，不能直接运行。迭代方法和设置属性值都是可以用的。