SpringMVC began to learn the Json

In this paper, a simple example of a small, brief SpringMVC development, Json related applications, only to learn to share, if any inadequacies, please correct me.

What is Json?

1. JSON refers to the JavaScript Object Notation (JavaScript Object Notation), a lightweight data interchange format text, smaller than XML, faster, and easier to resolve.
2. JSON is independent of the language: JSON with Javascript syntax to describe data objects, but JSON is still independent of language and platform.
3. JSON self descriptive, easier to understand.

SpringMVC support Json steps

On the basis of above SpringMVC annotation support, the need to support returns Json data format, the following steps:

1. Import jackson three support packages (if not import the package, will be reported 406 errors)

Jar package need to import as follows:

1  // three needs requires human jackson packet 
2 jackson-2.2.1-Annotations .jar
 . 3 jackson-Core-2.2.1 .jar
 . 4 jackson-DataBind-2.2.1.jar

 

2. Add a note on the method @ResponseBody

As follows:

1  / ** 
2       * If you want to return Json, notes the need to increase @ResponseBody, otherwise it will return to the path as
 3       * 406 if an error is returned, the package is missing
 4       * @return 
5       * / 
6      @ RequestMapping ( "/ json01" )
 7      @ResponseBody
 . 8      public String json01 () {
 . 9          System.out.println ( "JSON is called ....." );
 10          return "the Hello World !!!" ;
 . 11      }

3. Access

Open your browser and enter the URL as follows:

SpringMVC different types of return Json

1. Return array

As shown below, directly back String [] to.

1  / * 
2       * Returns an array
 . 3       * @return 
. 4       * / 
. 5      @RequestMapping ( "/ json02" )
 . 6      @ResponseBody
 . 7      public String [] json02 () {
 . 8          System.out.println ( "... is called JSON .. " );
 . 9          String [] = ARR new new String [] {" Bob "," flower " };
 10          return ARR;
 . 11      }

Page is shown below:

 

2. Return the class object

As follows: User object returned directly

1  / * 
2       * returns the object
 . 3       * @return 
. 4       * / 
. 5      @RequestMapping ( "/ json03" )
 . 6      @ResponseBody
 . 7      public the User json03 () {
 . 8          System.out.println ( "JSON is called ..... " );
 . 9          the User User = new new the User (1L," Joe Smith ",. 3, new new a Date ());
 10          return User;
 . 11      }

As shown below: returns the format objects Json

If the object is returned in the date format, you will need to deal with the format returned

1  / * 
2       * from the background to the foreground, formatting
 . 3       * @return 
. 4       * / 
. 5      @JsonFormat (pattern = "the MM-dd-YYYY HH: mm: SS", TimeZone = "GMT +. 8" )
 . 6      public getDate DATE () {
 . 7          return DATE;
 . 8      }
 . 9      
10      / ** 
. 11       * from front to back, the received setting parameters format
 12 is       * @param DATE
 13 is       * / 
14      @DateTimeFormat (pattern = "the MM-dd-YYYY" )
 15      public  void setDate (a Date DATE) {
 16          the this .date = date;
17     }

3. Return to the list of objects

As follows: returns List <User> object list

1  / * 
2       * returns the object list
 . 3       * @return 
. 4       * / 
. 5      @RequestMapping ( "/ json04" )
 . 6      @ResponseBody
 . 7      public List <the User> json04 () {
 . 8          System.out.println ( "JSON is called. .... " );
 . 9          List <the User> LST = new new the ArrayList <the User> ();
 10          the User ZS = new new the User (1L," Joe Smith ",. 3, new new a Date ());
 . 11          the User LS = new new the User (2l, "John Doe",. 4, new new a Date ());
 12 is         User ww=new User(3l,"王五",5,new Date());
13         lst.add(zs);
14         lst.add(ls);
15         lst.add(ww);
16         return lst;
17     }

As shown below: it returns an array of object

Remark

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