JSONObject使用方法详解(2)_H5之家 - 中国HTML5教程资源分享第一站

public static void xmlToJSON(){ System.out.println("xml字符串转json字符串"); String xml = "<?xml version=\".\" encoding=\"UTF-\"?><user_info><password></password><username>张三</username></user_info>"; JSON json=XMLSerializer.read(xml); System.out.println("xml--->json \n"+json.toString()); }

question5：javabean怎么转换为json字符串？

public static void javaBeanToJSON() { System.out.println("javabean转json字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword(""); JSONObject json = JSONObject.fromBean(userInfo); System.out.println("javabean--->json \n" + json.toString()); }

question6：javabean怎么转换为xml字符串？

public static void javaBeanToXML() { System.out.println("javabean转xml字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword(""); JSONObject json = JSONObject.fromBean(userInfo); XMLSerializer xmlSerializer = new XMLSerializer(); String xml = xmlSerializer.write(json, "UTF-"); System.out.println("javabean--->xml \n" + xml); }

完整的JSONObject_1_3.java代码如下：

JSONObject_1_3 package json; import net.sf.json.JSON; import net.sf.json.JSONObject; import net.sf.json.xml.XMLSerializer; public class JSONObject__ { public static void javaToJSON() { System.out.println("java代码封装为json字符串"); JSONObject jsonObj = new JSONObject(); jsonObj.put("username", "张三"); jsonObj.put("password", ""); System.out.println("java--->json \n" + jsonObj.toString()); } public static void jsonToJAVA() { System.out.println("json字符串转java代码"); String jsonStr = "{\"password\":\"\",\"username\":\"张三\"}"; JSONObject jsonObj = JSONObject.fromString(jsonStr); String username = jsonObj.getString("username"); String password = jsonObj.optString("password"); System.out.println("json--->java\n username=" + username + "\t password=" + password); } public static void jsonToXML() { System.out.println("json字符串转xml字符串"); String jsonStr = "{\"password\":\"\",\"username\":\"张三\"}"; JSONObject json = JSONObject.fromString(jsonStr); XMLSerializer xmlSerializer = new XMLSerializer(); xmlSerializer.setRootName("user_info"); xmlSerializer.setTypeHintsEnabled(false); String xml = xmlSerializer.write(json); System.out.println("json--->xml \n" + xml); } public static void javaBeanToJSON() { System.out.println("javabean转json字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword(""); JSONObject json = JSONObject.fromBean(userInfo); System.out.println("javabean--->json \n" + json.toString()); } public static void javaBeanToXML() { System.out.println("javabean转xml字符串"); UserInfo userInfo = new UserInfo(); userInfo.setUsername("张三"); userInfo.setPassword(""); JSONObject json = JSONObject.fromBean(userInfo); XMLSerializer xmlSerializer = new XMLSerializer(); String xml = xmlSerializer.write(json, "UTF-"); System.out.println("javabean--->xml \n" + xml); } public static void xmlToJSON(){ System.out.println("xml字符串转json字符串"); String xml = "<?xml version=\".\" encoding=\"UTF-\"?><user_info><password></password><username>张三</username></user_info>"; JSON json=XMLSerializer.read(xml); System.out.println("xml--->json \n"+json.toString()); } public static void main(String args[]) { // javaToJSON(); // jsonToJAVA(); // jsonToXML(); // javaBeanToJSON(); // javaBeanToXML(); xmlToJSON(); } }

完整的UserInfo.java代码如下：

UserInfo package json; public class UserInfo { public String username; public String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }

result

代码和运行结果都已经贴在每个问题的后面，运行时直接用main方法分别对每个方法运行即可看到测试效果。

note.txt是报的对应的错误及解决方法，也从另一个方面说明为什么需要导入前面提到的jar包；

note.txt文件内容如下：

java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException at java.lang.ClassLoader.defineClass0(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:537) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123) at java.net.URLClassLoader.defineClass(URLClassLoader.java:251) at java.net.URLClassLoader.access$100(URLClassLoader.java:55) at java.net.URLClassLoader$1.run(URLClassLoader.java:194) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:187) at java.lang.ClassLoader.loadClass(ClassLoader.java:289) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) at generate.TestJSONObject.main(TestJSONObject.java:40) Exception in thread "main"

解决方案：导入commons-lang-2.1.jar