如题
2.例子.
import com.alibaba.fastjson.JSON; public class Person { int age; String name; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public static void main(String[] args) { String jsonString="{\"name\":\"hah\",\"age\":1}"; Person person = JSON.parSEObject(jsonString,Person.class); System.out.println(1); } }
3.参考.
上面为本人的例子,下面是摘录自博客园这位叫PointNet的博主的比较完整的文章:
http://www.cnblogs.com/goody9807/p/4244862.html
二. fastjson 解析json字符串为四种类型 1. JavaBean Person person = JSON.parSEObject(jsonString,Person.class); 2. List<JavaBean> List<Person> listPerson =JSON.parseArray(jsonString,Person.class); 3. List<String> List<String> listString = JSON.parseArray(jsonString,String.class); 4. List<Map<String,Object>> List<Map<String,Object>> listMap = JSON.parSEObject(jsonString,new TypeReference<List<Map<String,Object>>>(){}); (注意:此处可看出fastjson反射机制比gson更准确, id = 1001 通过fastjson反射仍是 id = 1001,而通过gson反射结果 为 id =1001.0,JSON解析器fastjson(阿里巴巴出品,版本1.1.26),如果定义了JSONObject为{"JACKIE_ZHANG":"张学友","ANDY_LAU":"刘德华","LIMING":"黎明","Aaron_Kwok":"郭富城"},那么读取值时,KEY顺序无序,测试代码: import com.alibaba.fastjson.JSONObject; /** * Created by wangzhenfei on 14-4-15. */ public class FastJsonTest { public static void main(String[] args){ String jsonStr = "{\"JACKIE_ZHANG\":\"张学友\",\"ANDY_LAU\":\"刘德华\",\"LIMING\":\"黎明\",\"Aaron_Kwok\":\"郭富城\"}" ; //做5次测试 for(int i=0,j=5;i<j;i++) { JSONObject jsonObject = JSONObject.parSEObject(jsonStr) ; for(java.util.Map.Entry<String,Object> entry:jsonObject.entrySet()){ System.out.print(entry.getKey()+"-"+entry.getValue()+"\t"); } System.out.println();//用来换行 } } } 运行结果: LIMING-黎明 Aaron_Kwok-郭富城JACKIE_ZHANG-张学友ANDY_LAU-刘德华 Aaron_Kwok-郭富城 ANDY_LAU-刘德华LIMING-黎明JACKIE_ZHANG-张学友 Aaron_Kwok-郭富城 JACKIE_ZHANG-张学友ANDY_LAU-刘德华LIMING-黎明 LIMING-黎明 ANDY_LAU-刘德华JACKIE_ZHANG-张学友Aaron_Kwok-郭富城 JACKIE_ZHANG-张学友 LIMING-黎明ANDY_LAU-刘德华Aaron_Kwok-郭富城 解决办法:定义为JSONArray,代码如下: import com.alibaba.fastjson.JSONArray; /** * Created by wangzhenfei on 14-4-15. */ public class FastJsonTest { public static void main(String[] args){ String jsonStr = "[{\"JACKIE_ZHANG\":\"张学友\"},{\"ANDY_LAU\":\"刘德华\"},{\"LIMING\":\"黎明\"},{\"Aaron_Kwok\":\"郭富城\"}]" ; //做5次测试 for(int i=0,j=5;i<j;i++) { JSONArray jsonArray = JSONArray.parseArray(jsonStr); for(int k=0;k<jsonArray.size();k++){ System.out.print(jsonArray.get(k) + "\t"); } System.out.println();//用来换行 } } } 运行结果为: {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"} {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"} {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"} {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"} {"JACKIE_ZHANG":"张学友"} {"ANDY_LAU":"刘德华"}{"LIMING":"黎明"}{"Aaron_Kwok":"郭富城"} 如果就想要定义为JSONObject,而不是JSONArray,可以选用其他JSON解析器,个人推荐使用google的gson,文档明显比fastjson好很多(从这里可以看出阿里巴巴和谷歌的差距): import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParser; /** * Created by wangzhenfei on 14-4-15. */ public class FastJsonTest { public static void main(String[] args){ String jsonStr = "{\"JACKIE_ZHANG\":\"张学友\",\"Aaron_Kwok\":\"郭富城\"}" ; //做5次测试 for(int i=0,j=5;i<j;i++) { JsonObject jsonObject = (JsonObject) new JsonParser().parse(jsonStr); for(java.util.Map.Entry<String,JsonElement> entry:jsonObject.entrySet()){ System.out.print(entry.getKey()+"-"+entry.getValue()+"\t"); } System.out.println();//用来换行 } } } 运行结果: JACKIE_ZHANG-"张学友" ANDY_LAU-"刘德华" LIMING-"黎明" Aaron_Kwok-"郭富城" JACKIE_ZHANG-"张学友" ANDY_LAU-"刘德华" LIMING-"黎明" Aaron_Kwok-"郭富城" JACKIE_ZHANG-"张学友" ANDY_LAU-"刘德华" LIMING-"黎明" Aaron_Kwok-"郭富城" JACKIE_ZHANG-"张学友" ANDY_LAU-"刘德华" LIMING-"黎明" Aaron_Kwok-"郭富城" JACKIE_ZHANG-"张学友" ANDY_LAU-"刘德华" LIMING-"黎明" Aaron_Kwok-"郭富城"