https://github.com/stleary/JSON-Java-unit-test

[java] view plaincopy

1. public static void jsonObjectTest() {
2. ﾠ ﾠ JSONObject jsonobj = new JSONObject("{'name':'xiazdong','age':20}");
3. String name = jsonobj.getString("name");
4. ﾠ ﾠ int age = jsonobj.getInt("age");
5. System.out.println("name = " + name + ",age = " + age);
6. }

[plain] view plaincopy

1. public static void jsonArrayTest() {
2. ﾠ ﾠ JSONArray jsonarray = new JSONArray("[{'name':'xiazdong','age':20},{'name':'xzdong','age':15}]");
3. ﾠ ﾠ for (int i = 0; i < jsonarray.length(); i++) {
4. ﾠ ﾠ ﾠ ﾠﾠJSONObject jsonobj = jsonarray.getJSONObject(i);
5. String name = jsonobj.getString("name");
6. int age = jsonobj.getInt("age");
7. System.out.println("name = " + name + ",age = " + age);
8. }
9. }

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1. public static void jsonObjectAndArrayTest() {
2. ﾠ ﾠ String jsonstring = "{'name':'xiazdong','age':20,'book':['book1','book2']}";
3. ﾠ ﾠ JSONObject jsonobj = new JSONObject(jsonstring);
4. String name = jsonobj.getString("name");
5. ﾠ ﾠ System.out.println("name" + ":" + name);
6. int age = jsonobj.getInt("age");
7. System.out.println("age" + ":" + age);
8. ﾠ ﾠ JSONArray jsonarray = jsonobj.getJSONArray("book");
9. ﾠ ﾠ for (int i = 0; i < jsonarray.length(); i++) {
10. String book = jsonarray.getString(i);
11. ﾠ ﾠ ﾠ ﾠ System.out.println("book" + i + ":" + book);
12. }
13. }

[java] view plaincopy

1. public static void jsonStringerTest() {
2. ﾠ ﾠ JSONStringer stringer = new JSONStringer();
3. stringer.object().key("name").value("xiazdong").key("age").value(20).endObject();
4. ﾠ ﾠ System.out.println(stringer);
5. }

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1. public static void jsonStringerTest2() throws FileNotFoundException {
2. ﾠ ﾠ JSONStringer jsonStringer = new JSONStringer();
3. ﾠ ﾠ JSONObject obj6 = new JSONObject();
4. obj6.put("title", "book1").put("price", "$11");
5. ﾠ ﾠ JSONObject obj3 = new JSONObject();
6. obj3.put("book", obj6);
7. ﾠ ﾠ obj3.put("author", new JSONObject().put("name", "author-1"));
8. ﾠ ﾠ JSONObject obj5 = new JSONObject();
9. obj5.put("title", "book2").put("price", "$22");
10. ﾠ ﾠ JSONObject obj4 = new JSONObject();
11. obj4.put("book", obj5);
12. ﾠ ﾠobj4.put("author", new JSONObject().put("name", "author-2"));
13. ﾠ ﾠ JSONArray obj2 = new JSONArray();
14. obj2.put(obj3).put(obj4);
15. ﾠ ﾠ JSONObject obj1 = new JSONObject();
16. obj1.put("title", "BOOK");
17. obj1.put("signing", obj2);
18. jsonStringer.object().key("session").value(obj1).endObject();
19. System.out.println(jsonStringer.toString());
20. ﾠ ﾠ PrintWriter out = new PrintWriter(new FileOutputStream("1.txt"));
21. ﾠ ﾠ out.println(jsonStringer.toString());
22. out.close();
23. }

[java] view plaincopy

1. public static void JSONTokenerTest() throws FileNotFoundException {
2. JSONObject jsonobj = new JSONObject(new JSONTokener(new FileReader(new File("1.txt"))));
3. System.out.println(jsonobj.getJSONObject("session").getJSONArray("signing").getJSONObject(1).getJSONObject("book").getString("title"));
4. }

JSON in Java [package org.json]JSON is a light-weight, language independent, data interchange format.
See http://www.JSON.org/The files in this package implement JSON encoders/decoders in Java.
It also includes the capability to convert between JSON and XML, HTTP
headers, Cookies, and CDL.This is a reference implementation. There is a large number of JSON packages
in Java. Perhaps someday the Java community will standardize on one. Until
then, choose carefully.The license includes this restriction: "The software shall be used for good,
not evil." If your conscience cannot live with that, then choose a different
package.The package compiles on Java 1.6-1.8.JSONObject.java: The JSONObject can parse text from a String or a JSONTokener
to produce a map-like object. The object provides methods for manipulating its
contents, and for producing a JSON compliant object serialization.JSONArray.java: The JSONObject can parse text from a String or a JSONTokener
to produce a vector-like object. The object provides methods for manipulating
its contents, and for producing a JSON compliant array serialization.JSONTokener.java: The JSONTokener breaks a text into a sequence of individual
tokens. It can be constructed from a String, Reader, or InputStream.JSONException.java: The JSONException is the standard exception type thrown
by this package.JSONPointer.java: Implementation of
[JSON Pointer (RFC 6901)](https://tools.ietf.org/html/rfc6901). Supports
JSON Pointers both in the form of string representation and URI fragment
representation.JSONString.java: The JSONString interface requires a toJSONString method,
allowing an object to provide its own serialization.JSONStringer.java: The JSONStringer provides a convenient facility for
building JSON strings.JSONWriter.java: The JSONWriter provides a convenient facility for building
JSON text through a writer.CDL.java: CDL provides support for converting between JSON and comma
delimited lists.Cookie.java: Cookie provides support for converting between JSON and cookies.CookieList.java: CookieList provides support for converting between JSON and
cookie lists.HTTP.java: HTTP provides support for converting between JSON and HTTP headers.HTTPTokener.java: HTTPTokener extends JSONTokener for parsing HTTP headers.XML.java: XML provides support for converting between JSON and XML.JSONML.java: JSONML provides support for converting between JSONML and XML.XMLTokener.java: XMLTokener extends JSONTokener for parsing XML text.Unit tests are maintained in a separate project. Contributing developers can test
JSON-java pull requests with the code in this project:
https://github.com/stleary/JSON-Java-unit-test

package com.json;import java.text.ParseException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;/*** 使用json-lib构造和解析Json数据* * @author Alexia* @date 2013/5/23* */
public class OrgJsonTest {/*** 构造Json数据* * @return* @throws JSONException*/public static String BuildJson() throws JSONException {// JSON格式数据解析对象JSONObject jo = new JSONObject();// 下面构造两个map、一个list和一个Employee对象Map<String, String> map1 = new HashMap<String, String>();map1.put("name", "Alexia");map1.put("sex", "female");map1.put("age", "23");Map<String, String> map2 = new HashMap<String, String>();map2.put("name", "Edward");map2.put("sex", "male");map2.put("age", "24");List<Map> list = new ArrayList<Map>();list.add(map1);list.add(map2);Employee employee = new Employee();employee.setName("wjl");employee.setSex("female");employee.setAge(24);// 将Map转换为JSONArray数据JSONArray ja = new JSONArray();ja.put(map1);System.out.println("JSONArray对象数据格式：");System.out.println(ja.toString());// 将Javabean转换为Json数据（需要Map中转）JSONObject jo1 = JsonHelper.toJSON(employee);System.out.println("\n仅含Employee对象的Json数据格式：");System.out.println(jo1.toString());// 构造Json数据，包括一个map和一个含Employee对象的Json数据jo.put("map", ja);jo.put("employee", jo1.toString());System.out.println("\n最终构造的JSON数据格式：");System.out.println(jo.toString());return jo.toString();}/*** 解析Json数据* * @param jsonString*            Json数据字符串* @throws JSONException* @throws ParseException*/public static void ParseJson(String jsonString) throws JSONException,ParseException {JSONObject jo = new JSONObject(jsonString);JSONArray ja = jo.getJSONArray("map");System.out.println("\n将Json数据解析为Map：");System.out.println("name: " + ja.getJSONObject(0).getString("name")+ " sex: " + ja.getJSONObject(0).getString("sex") + " age: "+ ja.getJSONObject(0).getInt("age"));String jsonStr = jo.getString("employee");Employee emp = new Employee();JsonHelper.toJavaBean(emp, jsonStr);System.out.println("\n将Json数据解析为Employee对象：");System.out.println("name: " + emp.getName() + " sex: " + emp.getSex()+ " age: " + emp.getAge());}/*** @param args* @throws JSONException* @throws ParseException*/public static void main(String[] args) throws JSONException, ParseException {// TODO Auto-generated method stubParseJson(BuildJson());}}

运行结果如下

五、与json-lib比较

json-lib和org.json的使用几乎是相同的，我总结出的区别有两点：

1. org.json比json-lib要轻量得多，前者没有依赖任何其他jar包，而后者要依赖ezmorph和commons的lang、logging、beanutils、collections等组件

2. json-lib在构造bean和解析bean时比org.json要方便的多，json-lib可直接与bean互相转换，而org.json不能直接与bean相互转换而需要map作为中转，若将bean转为json数据，首先需要先将bean转换为map再将map转为json，比较麻烦。

总之，还是那句话—适合自己的才是最好的，大家要按需选取使用哪种方法进行解析。最后给大家介绍两款解析Json数据的工具：一是在线工具JSON Edit（http://braincast.nl/samples/jsoneditor/）；另一个是Eclipse的插件JSON Tree Analyzer，都很好用，推荐给大家使用！

http://www.cnblogs.com/lanxuezaipiao/archive/2013/05/24/3096437.html