Use fastjson to parse JSON data (1)

It is said that fastjson is currently the fastest database for parsing JSON data, and is an open-source library developed by Chinese people. Top, pay on the official website: http://code.alibabatech.com/wiki/pages/viewpage.action? Pageid = 2424946

To use fastjson, first download the corresponding JAR file and download it on the official website.
The first example for beginners is provided:

{    "statuses":[        {         "id": 912345678901,         "text": "How do I stream JSON in Java?",         "geo": null,         "user": {        "name": "json_newb",        "followers_count": 41              }          },                  {         "id": 777777777888,         "text": "dfngsdnglnsldfnsl",         "geo": null,         "user": {        "name": "dsfgpd",        "followers_count": 24              }          }     ]}

Bean class of allbean:

package com.lee.JsonToBean;public class AllBean {    private long id;    private String text;    private String geo;    private UserBean userBean;    public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public String getText() {        return text;    }    public void setText(String text) {        this.text = text;    }    public String getGeo() {        return geo;    }    public void setGeo(String geo) {        this.geo = geo;    }    public UserBean getUserBean() {        return userBean;    }    public void setUserBean(UserBean userBean) {        this.userBean = userBean;    }    }

Bean class of userbean:

package com.lee.JsonToBean;public class UserBean {    private String name;    private int followers_count;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getFollowers_count() {        return followers_count;    }    public void setFollowers_count(int followers_count) {        this.followers_count = followers_count;    }}

Parsing class jsonbean:

Package COM. lee. jsontobean; import Java. io. file; import Java. io. fileinputstream; import Java. io. filenotfoundexception; import Java. io. ioexception; import Java. util. list; import javax. swing. text. badlocationexception; import javax. swing. text. defaultstyleddocument; import javax. swing. text. RTF. rtfeditorkit; import COM. alibaba. fastjson. JSON; import COM. alibaba. fastjson. jsonarray; import COM. alibaba. fastjson. jsonob Ject;/*** {"statuses": [{"ID": 912345678901, "text": "How do I stream JSON in Java? "," Geo ": NULL," user ": {" name ":" json_newb "," followers_count ": 41 },{" ID ": 777777777888," text ": "dfngsdnglnsldfnsl", "Geo": NULL, "user": {"name": "dsfgpd", "followers_count ": 24}]} **/public class jsonbean {rtfeditorkit RTF; defaultstyleddocument DSD; string text; public static void main (string [] ARGs) {jsonbean bean = new jsonbean (); // convert the string into a JSON object. This is because my JSON data is first the JSON object jsonobject jobj = JSON. parseobject (bean. readrtf (new file ("JSON. rtf "); // then jsonarray, you can know jsonarray arr = jobj based on my JSON data. getjsonarray ("statuses"); // list the items from the Bean class to each JSON array <allbean> listbeans = JSON. parsearray (ARR. tostring (), allbean. class); // traverse for (allbean bean _: listbeans) {// obtain the first layer of Data System from the JSON data of my demo. out. println (bean _. gettext (); system. out. println (bean _. GETID (); // obtain the second-level data system from the JSON data of this demo. out. println (bean _. getuserbean (). getfollowers_count () ;}// because I put the JSON data into the RTF file, this is to read the JSON data of the RTF file and convert it to the string Public String readrtf (file in) {RTF = new rtfeditorkit (); DSD = new defaultstyleddocument (); try {RTF. read (New fileinputstream (in), DSD, 0); text = new string (DSD. gettext (0, DSD. getlength ();} catch (filenotfoundexception e) {// todo auto-generated Catch Block E. printstacktrace ();} catch (ioexception e) {// todo auto-generated Catch Block E. printstacktrace ();} catch (badlocationexception e) {// todo auto-generated Catch Block E. printstacktrace ();} return text ;}}

Finally, add the program code: fastjsontest.zip.