Jackson parsing JSON method in the "736C677C4" Spring Framework __div

From a person on the CSDN blog relay, his blog address is: http://blog.csdn.net/wyc_cs/article/details/6679722

Package Com.bbs.utils.json;
Import java.io.IOException;
Import java.util.ArrayList;
Import Java.util.HashMap;
Import Java.util.Iterator;
Import Java.util.LinkedHashMap;
Import java.util.List;
Import Java.util.Map;

Import Java.util.Set;
Import Org.codehaus.jackson.JsonGenerator;
Import org.codehaus.jackson.JsonParseException;
Import org.codehaus.jackson.map.JsonMappingException;
Import Org.codehaus.jackson.map.ObjectMapper;

Import Org.codehaus.jackson.node.JsonNodeFactory;
 public class Jacksontest {private static jsongenerator jsongenerator = null;
 private static Objectmapper objectmapper = null;

 private static user user = null; The public static void Writeentity2json () throws IOException {System.out.println ("uses a Jsongenerator transform entity as a JSON string-------------
  ");
  WriteObject can convert Java objects, Eg:javabean/map/list/array, and other jsongenerator.writeobject (user);
  System.out.println ();
  System.out.println ("Use Objectmapper-----------"); WriteValue has the same functionality as WriteObject Objectmapper.writevalue (System. out, user);
  public static void Writelist2json () throws IOException {list<user> userlist = new arraylist<user> ();
  Userlist.add (user);
  User U = new user ();
  U.setuid (10);
  U.setuname ("Archie");
  U.setupwd ("123");
  Userlist.add (U);
 Objectmapper.writevalue (System.out, userlist);
   public static void Writemap2json () {try {map<string, object> Map = new hashmap<string, object> ();
   User U = new user ();
   U.setuid (10);
   U.setuname ("Archie");
   U.setupwd ("123");
   Map.put ("UID", U.getuid ());
   Map.put ("Uname", U.getuname ());
   Map.put ("Upwd", U.getupwd ());
   System.out.println ("Jsongenerator");
   Jsongenerator.writeobject (map);
  Objectmapper.writevalue (System.out, map);
  catch (IOException e) {e.printstacktrace ();
   The public static void Writeothersjson () {try {string[] arr = {"A", "B", "C"};
   System.out.println ("Jsongenerator");
   String str = "Hello World jackson!"; Byte Jsongenerator.writebinary (Str.getbytes ());
   Boolean Jsongenerator.writeboolean (True);
   Null jsongenerator.writenull ();
   Float Jsongenerator.writenumber (2.2f);
   Char Jsongenerator.writeraw ("C");
   String Jsongenerator.writeraw (str, 5, 10);
   String Jsongenerator.writerawvalue (str, 5, 5);
   String jsongenerator.writestring (str);
   Jsongenerator.writetree (JsonNodeFactory.instance.POJONode (str));
   System.out.println (); Object jsongenerator.writestartobject ();//{Jsongenerator.writeobjectfieldstart ("user");//User:jsongenerato R.writestringfield ("name", "Jackson");//Name:jackson Jsongenerator.writebooleanfield ("Sex", true);//Sex:true Jsong
   Enerator.writenumberfield ("Age");//Age:22 jsongenerator.writeendobject ();
   Jsongenerator.writearrayfieldstart ("Infos");//infos:[Jsongenerator.writenumber (22);//22 Jsongenerator.writestring ("This is Array");/This is array jsongenerator.writeendarray ();//] Jsongenerator.writeenDobject ()//} User U = New user ();
   User.setuid (5);
   User.setuname ("Tom");
   User.setupwd ("123");
   User.setnumber (3.44); Complex Object Jsongenerator.writestartobject ()//{Jsongenerator.writeobjectfield ("UID", u);//User:{bean} J Songenerator.writeobjectfield ("Infos", arr);//Infos:[array] Jsongenerator.writeendobject ();/}} catch (Exception E
  ) {e.printstacktrace (); /** * JSON string converted to object/public static void Readjson2entity () {String json = "{\ uid\": 5,\ "uname\": \ "tom\", \ "n
  Umber\ ": 3.44,\" upwd\ ": \" 123\ "}";
   try {User acc = objectmapper.readvalue (JSON, user.class);
   System.out.println (Acc.getuid ());
  SYSTEM.OUT.PRINTLN (ACC);
  catch (Jsonparseexception e) {e.printstacktrace ();
  catch (Jsonmappingexception e) {e.printstacktrace ();
  catch (IOException e) {e.printstacktrace (); }/** * JSON is converted to list object/public static void Readjson2list () {String json = ' [{\ uid\ ': 1,\ ' uname\ ': \ ' www\ ', \ ' n Umber\ ": 234, \ "upwd\": \ "456\"}, "+" {\ "uid\": 5,\ "uname\": \ "tom\", \ "Number\": 3.44,\ "upwd\": \ "123\"}] ";
   try {list<linkedhashmap<string, object>> List = Objectmapper.readvalue (JSON, list.class);
   System.out.println (List.size ());
    for (int i = 0; i < list.size (); i++) {map<string, object> Map = List.get (i);
    set<string> set = Map.keyset (); for (iterator<string> it = Set.iterator (); It.hasnext ();)
     {String key = It.next ();
    SYSTEM.OUT.PRINTLN (key + ":" + map.get (key));
  A catch (Jsonparseexception e) {e.printstacktrace ());
  catch (Jsonmappingexception e) {e.printstacktrace ();
  catch (IOException e) {e.printstacktrace (); }/** * JSON transforms an array object/public static void Readjson2array () {String json = ' [{\ uid\ ': 1,\ ' uname\ ': \ ' www\ ', \ ' Nu
  Mber\ ": 234,\" upwd\ ": \" 456\ "}," + "{\" uid\ ": 2,\" uname\ ": \" sdfsdf\ ", \" Number\ ": 4745,\" upwd\ ": \" 23456\ "}]"; try {user[] arr = Objectmapper.readvalue (JSON,User[].class);
   System.out.println (arr.length);
   for (int i = 0; i < arr.length i++) {System.out.println (arr[i]);
  } catch (Jsonparseexception e) {e.printstacktrace ();
  catch (Jsonmappingexception e) {e.printstacktrace ();
  catch (IOException e) {e.printstacktrace (); }/** * JSON converted to map object/public static void Readjson2map () {String json = ' {\ success\ ': true,\ ' a\ ': {\ ' address\ ":" "address2\", \ "name\": \ "haha2\", "id\": 2,\ "email\": \ "Email2\"}, "+" \ "b\": {\ "address\": \ "Address\", \ "name\": \ "
  Haha\ ", \" id\ ": 1,\" email\ ": \" Email\ "}";
   try {map<string, map<string, object>> maps = Objectmapper.readvalue (JSON, map.class);
   System.out.println (Maps.size ());
   set<string> key = Maps.keyset ();
   Iterator<string> iter = Key.iterator ();
    while (Iter.hasnext ()) {String field = Iter.next ();
   System.out.println (Field + ":" + maps.get (field));
  } catch (Jsonparseexception e) {e.printstacktrace (); } CATCH (jsonmappingexception e) {e.printstacktrace ();
  catch (IOException e) {e.printstacktrace ();
  } public static void Main (string[] args) {user = new user ();
  User.setuid (5);
  User.setuname ("Tom");
  User.setupwd ("123");
  User.setnumber (3.44);
  Objectmapper = new Objectmapper ();
   try {//jsongenerator = Objectmapper.getjsonfactory (). Createjsongenerator (System.out, Jsonencoding.utf8);
   Writeentity2json ();
   Writemap2json ();
   Writelist2json ();
   Writeothersjson ();
   Readjson2entity ();
Readjson2list ();
   Readjson2array ();
  Readjson2map ();
  catch (Exception e) {e.printstacktrace ();

}} ========================user.java============== package Com.bbs.utils.json;
 public class User {private int uid;
 Private String uname;
 Private String upwd;
 private double number;
 Public double GetNumber () {return number;
 public void Setnumber (double) {this.number = number; public int Getuid () {returnUid
 The public void setUid (int uid) {this.uid = UID;
 Public String Getuname () {return uname;
 } public void Setuname (String uname) {this.uname = uname;
 Public String getupwd () {return upwd;
 } public void Setupwd (String upwd) {this.upwd = upwd; }
 
}