Simple use of the Convert JSON tool--jackson

　　What is Jackson?

Conversion of Java objects to JSON strings can be easily implemented

Preparatory work: Guide Package

Jackson's Jar All:http://jackson.codehaus.org/1.7.6/jackson-all-1.7.6.jar

　1. The entity object goes to JSON　　

　Jackson uses Getter method to locate attributes (not fields)
You can omit some getter by adding a callout @JsonIgnore

To convert an object or collection to a JSON string

 PackageCn.jackson;Importjava.io.IOException;Importjava.util.Arrays;Importjava.util.List;Importorg.codehaus.jackson.JsonGenerationException;ImportOrg.codehaus.jackson.annotate.JsonIgnore;Importorg.codehaus.jackson.map.JsonMappingException;ImportOrg.codehaus.jackson.map.ObjectMapper; Public classCustomer {PrivateString name; PrivateString ID;  PublicCustomer () {Super(); }     PublicCustomer (string name, string id) {Super();  This. Name =name;  This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicString getId () {returnID; }     Public voidsetId (String id) { This. ID =ID; } @JsonIgnore PublicString getcity () {returnBeijing; }     PublicString Getbirth () {return"1988"; }         Public Static voidMain (string[] args)throwsjsongenerationexception, Jsonmappingexception, IOException {//Guide Package//Create a Objectmapper objectObjectmapper mapper =NewObjectmapper (); //Customer cust =NewCustomer ("Jackson", "1001"); String Jsonstr=mapper.writevalueasstring (Cust);                System.out.println (JSONSTR); List<Customer> list = (list) arrays.aslist (Cust,NewCustomer ("33", "off-soul meter")); String jsonstrlist=mapper.writevalueasstring (list);        System.out.println (jsonstrlist); /*** Jackson uses Getter method to position properties * can be ignored by adding annotations @JsonIgnore to make some getter*/    }}

　　Results:

{"Name": "Jackson", "id": "1001", "Birth": "1988"}[{"name": "Jackson", "id": "1001", "Birth": "1988"},{"name": " "," "id": "Off-soul meter", "Birth": "1988"}]

　So ajax_day02 can switch to using Jackson to simplify:

    Objectmapper mapper=New  objectmapper ();        String result=mapper.writevalueasstring (SC);

　　2.JSON string to object

New Objectmapper ();         = "{\" name\ ": \" jackson\ ", \" id\ ": \" 1001\ "}";         = Mapper.readvalue (JSON, Customer.  Class);        System.out.println (C.getid ());

　Note "The Escape operation

Simple use of the Convert JSON tool--jackson