java物件轉json

    public class MsgInfo2 {  
        private String message;   
        private String flag;  
        public String getMessage() {  
            return message;  
        }  
        public void setMessage(String message) {  
            this.message = message;  
        }  
        public
 
 String getFlag() {  
            return flag;  
        }  
        public void setFlag(String flag) {  
            this.flag = flag;  
        }   

    }  

    public class Test1 {  

        public static void main(String[] args) {  
            MsgInfo2 m2 = new MsgInfo2();  
            m2.setFlag("00"
 
);  
            m2.setMessage("message");  
            tojson(m2);  

            String json = "{'message':'message1','flag':'00'}";  
            toObject(json);  
        }  

        public static void tojson(MsgInfo2 m) {  
            // 將物件編譯成json  
            Gson gson = new Gson();  
            String result = gson.toJson(m);  
            System.out
 
.println(result);  
            // 輸出：{"message":"message","flag":"00"}  
        }  

        public static void toObject(String m) {  
            // 將json編譯成物件  
            Gson gson = new Gson();  
            MsgInfo2 msg = gson.fromJson(m, MsgInfo2.class);  
            System.out.println(msg.getFlag());//輸出:00  
            System.out.println(msg.getMessage());//輸出：message1  
        }  
    }  

json轉java物件

json的結構如下：

{
      "org":     {
          "orgId": "orgId",
          "orgName": "orgName"
      },
      "biz":     [
                  {
              "appcode": 55,

              "subscode": "subscode0"
          },
                  {
              "appcode": 66,
              "subscode": "subscode1"
          }
      ]
  }

    public class ComOpen {  
        private Org org;  
        private List<BizObject> biz;  
        public Org getOrg() {  
            return org;  
        }  
        public void setOrg(Org org) {  
            this.org = org;  
        }  
        public List<BizObject> getBiz() {  
            return biz;  
        }  
        public void setBiz(List<BizObject> biz) {  
            this.biz = biz;  
        }  
    }  

    public class Org {  
        private String orgId;  
        private String orgName;  
        public String getOrgId() {  
            return orgId;  
        }  
        public void setOrgId(String orgId) {  
            this.orgId = orgId;  
        }  
        public String getOrgName() {  
            return orgName;  
        }  
        public void setOrgName(String orgName) {  
            this.orgName = orgName;  
        }  
    }  

    public class BizObject {  
        private int appcode;  
        private String subscode;  
        public String getSubscode() {  
            return subscode;  
        }  
        public void setSubscode(String subscode) {  
            this.subscode = subscode;  
        }  
        public int getAppcode() {  
            return appcode;  
        }  
        public void setAppcode(int appcode) {  
            this.appcode = appcode;  
        }  
    }  

    /** 
     * 測試java物件和json轉換 
     * 
     * @author yangliang 
     * @version 1.0 
     * @created 2011-10-11 下午03:14:04 
     * @history  
     * @see 
     */  
    public class Test2 {  
        public static void main(String[] args) {  
            toJson();  
            toObject();  
        }  
        public static void toJson(){  
            ComOpen como = new ComOpen();  
            Org org = new Org();  
            org.setOrgId("orgId");  
            org.setOrgName("orgName");  
            como.setOrg(org);  
            List<BizObject> biz = new ArrayList<BizObject>();  
            BizObject bizObject = new BizObject();   
            bizObject.setAppcode(55);  
            bizObject.setSubscode("subscode0");  
            BizObject bizObject1 = new BizObject();   
            bizObject1.setAppcode(66);  
            bizObject1.setSubscode("subscode1");  
            biz.add(bizObject);  
            biz.add(bizObject1);  
            como.setBiz(biz);  
            Gson gson=new GsonBuilder().create();  
            String result = gson.toJson(como);  
            System.out.println(result);  
            //輸出{"org":{"orgId":"orgId","orgName":"orgName"},"biz":接下行  
            //[{"appcode":55,"subscode":"subscode0"},{"appcode":66,"subscode":"subscode1"}]}  
        }  

        public static void toObject(){  
            String json = "{'org':{'orgId':'orgId','orgName':'orgName'},'biz':" +  
             "[{'appcode':55,'subscode':'subscode0'},{'appcode':66,'subscode':'subscode1'}]}";  
            Gson gson=new Gson();  
            ComOpen  m3 = gson.fromJson(json, ComOpen.class);  
            System.out.println(m3.getBiz().size());//2  
            System.out.println("orgId："+m3.getOrg().getOrgId());//orgId：orgId  
            System.out.println("appcode："+ m3.getBiz().get(0).getAppcode());//appcode：55  
        }  
    }