JSON与JAVA数据的相互转换(基本应用)

 下载json及其依赖包：

：/projects/json-lib/files/

ezmorph-1.0. /

以下的包都能在apache的官网上下载。

 

我下载的都是最新版本(最新版的json与其它版本有所不同)

一、将任意的javaBean对象转换为json字符串：

        Object obj=XXX;//任意一个javabean的对象都可以，但是这个javaBean必须是公开的，否则会报找不到get方法。

        JSONObject jo=(obj);

(());

        如果你的obj知道具体类型的话，还[可以使用JSONArray等对象来转换。其方法也类似。

二、将json字符串转换为javaBean对象：

        String str="json字符串对象";

        JSONObject jo=(obj);

        T t=(T)(jo,);

        XXXX

 

实例：

三个javabean对象：这三个对象很简单我就懒得加注释了。。。

public class T2 { private String aaa = "testAAA"; private String bbb = "testBBB"; public String getAaa() { return ; } public void setAaa(String aaa) { = aaa; } public String getBbb() { return ; } public void setBbb(String bbb) { = bbb; } }

public class T3 { private String aaa = "testAAA"; private String ccc = "testBBB"; public String getAaa() { return ; } public void setAaa(String aaa) { = aaa; } public String getCcc() { return ; } public void setCcc(String bbb) { = bbb; } }

import ; import ; public class T { private String str = "testStr"; private int age = 15; private List<String> listString = new ArrayList<String>(); { ("*"); ("*"); ("*"); } public List<String> getListString() { return ; } public void setListString(List<String> listString) { = listString; } private List<T2> test2 = new ArrayList<T2>(); { this.(new T2()); this.(new T2()); this.(new T2()); this.(new T2()); this.(new T2()); } public String getStr() { return ; } public void setStr(String str) { = str; } public int getAge() { return ; } public void setAge(int age) { = age; } public List<T2> getTest2() { return this.test2; } public void setTest2(List<T2> test2) { this.test2 = test2; } }

简单的测试代码：

import ; import ; public class Test { public static void main(String[] args) throws Exception { JSONObject jo = (new T()); String str = (()); (str); JSONObject jo2 = (str); T t = (T) (jo2, ); List<T2> lists2 = (t.getTest2()); for (Object t2 : lists2) {//这里的Object如果直接写成T2的话，会出错的，原因是JSON转换后的lists2对象因为它不知道类型，就解析成JSON里的某种格式了，我们需要再调用相同的方法将其转成我们所知的JavaBean (((T3) (JSONObject .fromObject(t2), )).getAaa()); } List<String> l3 = (); for (String s : l3) { (s); } } }

运行结果：

{"test2":[{"aaa":"testAAA","bbb":"testBBB"},{"aaa":"testAAA","bbb":"testBBB"},{"aaa":"testAAA","bbb":"testBBB"},{"aaa":"testAAA","bbb":"testBBB"},{"aaa":"testAAA","bbb":"testBBB"}],"age":15,"listString":["*","*","*"],"str":"testStr"}
testAAA
2010-5-1 0:41:50 toBean
警告: Tried to assign property bbb: to bean of class T3
2010-5-1 0:41:50 toBean
警告: Tried to assign property bbb: to bean of class T3
testAAA
2010-5-1 0:41:50 toBean
警告: Tried to assign property bbb: to bean of class T3
testAAA
2010-5-1 0:41:50 toBean
警告: Tried to assign property bbb: to bean of class T3
testAAA
2010-5-1 0:41:50 toBean
警告: Tried to assign property bbb: to bean of class T3
testAAA
*
*
*