Parsing json using fastjson, jackson, json-lib in Java-------------------mom doesn't have to worry about JSON parsing anymore.

1, Fastjson
Introduction Package
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.16</version>
</dependency>

JSON string goto Jsonobject/jsonarray
Jsonobject Jsonobject = Jsonobject.parseobject (jsonstring);
Get child nodes
Jsonobject. getString ();
Jsonobject. GetArray ();
Jsonobject. getDate ();
.....
Switch to JavaBean
Jsonobject.tojavaobject (jsonobject,javabean.class);
JSON string direct to JavaBean
Jsonobject.parseobject (jsonstring,javabean.class);
JavaBean to JSON string
String jsonstring = jsonobject.tojsonstring (javaBean)

2. Jackson

The package introduced
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.0</version>
</dependency>

JSON string Loaded JavaBean
Objectmapper = new Objectmapper ();
JavaBean javabean= objectmapper.readvalue (jsonstring, javabean.class);

JavaBean to JSON string
Objectmapper = new Objectmapper ();
WriteObject can convert Java objects, eg:javabean/map/list/array, etc.
Jsongenerator.writeobject (bean);
WriteValue has the same function as WriteObject
Objectmapper.writevalue (system.out, bean);

Get child nodes
Objectmapper mapper = new Objectmapper ();
Read json, the entire JSON as the root node
Jsonnode node = Mapper.readtree (jsonstring);
Node.get ();

1.//if The property does not have a value, then JSON is processed, the int type is 0,string type is null, the array is [], setting this attribute can ignore the null Value property
2. Mapper.setserializationinclusion (JsonInclude.Include.NON_EMPTY);
3.//let json be indented for better readability and generally used in the testing and development phases.
4. Mapper.configure (serializationfeature.indent_output, true);
5.//make map key in natural order
6. Mapper.configure (serializationfeature.order_map_entries_by_keys, true);
7.//date output format
8. SimpleDateFormat OutputFormat = new SimpleDateFormat ("yyyy-mm-dd");
9. Mapper.setdateformat (outputformat);

Create a node, generate a JSON string
1.//create a jsonnodefactory,false that provides all nodes without creating Decimalnode
2. Jsonnodefactory factory = new Jsonnodefactory (false);
3.
4.//create jsonfactory and output to console
5 using the streaming Api. Jsonfactory jsonfactory = new Jsonfactory ();
6. Jsongenerator Generator = Jsonfactory.creategenerator (system.out);
7. Objectmapper mapper = new Objectmapper ();
8.
9.//create nodes and data, a Objectnode represents a node object
10. Objectnode Node1 = Factory.objectnode ();
One. Objectnode node2 = Factory.objectnode ();
Node1.put ("a", "a");
Node1.put ("b", "b");
Node2.set ("C", node1);
.
16.//root node
17. Objectnode root = Factory.objectnode ();
Root.put ("root", "root");
Root.set ("children", node2);
Mapper.writetree (generator, root);
21.//output {"root": "root", "children": {"C": {"a": "a", "b": "b"}}}

Other arrays, lists, map references
Http://www.cnblogs.com/hoojo/archive/2011/04/22/2024628.html
http://blog.csdn.net/gjb724332682/article/details/51586701

3, Json-lib
The packages used
<!--json-lib-->
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.2</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>net.sf.ezmorph</groupId>
<artifactId>ezmorph</artifactId>
<version>1.0.6</version>
</dependency>

JSON string goto Jsonobject/jsonarray
Jsonobject Jsonobject = Jsonobject.fromobject (jsonstring/javabean);
Get child nodes
Jsonobject.getstring ("success")
Switch to JavaBean
Jsonobject.tobean (jsonobject,javabean.class);
JavaBean to JSON string
String jsonstring=jsonobject.tostring ();

List Map Reference
Http://www.cnblogs.com/teach/p/5791029.html

Parsing json using fastjson, jackson, json-lib in Java-------------------mom doesn't have to worry about JSON parsing anymore.