The use of JSON objects in Java

Source: Internet
Author: User

Disclaimer: I've never heard of JSON before work, maybe it's too much for me. It is possible that Ajax in front of the foreground is exposed to JSON, and these days require a JSON string to be returned in pure Java programming.

There are two jar packages for parsing JSON objects on the Web: Json-lib.jar and Json.jar, which mainly introduce Json-lib.jar.

The jar package address is as follows:

Json-lib-2.4-jdk15.jar all the jar packages required. rar

One, Json-lib.jar also relies on the following jar packages:

    1. Commons-lang.jar
    2. Commons-beanutils.jar
    3. Commons-collections.jar
    4. Commons-logging.jar
    5. Ezmorph.jar
    6. Json-lib-2.2.2-jdk15.jar

Second, the application

JSON also exists in the form of Key-value. Key is a string, and value can be a basic type, Jsonarray, Jsonobject.

Jsonarray:[], words too literally also know that he is an array form, and you can put more than one JSON

jsonobject:{} just put a JSON.

Because they can nest in more forms.

Third, the output JSON instance, considering the comparison of [], {}, distinguish the duplicate variables, the name of the variable is capitalized, it appears to be nonstandard.

ImportNet.sf.json.JSONArray;ImportNet.sf.json.JSONObject; Public classJsontest { Public Static voidMain (string[] args) {jsonobject container1=NewJsonobject (); Container1.put ("ClassName", "31 class High");                System.out.println (Container1.tostring ()); Jsonarray ClassName=NewJsonarray (); Classname.add ("31 Class High"); Container1.put ("ClassName", ClassName);                System.out.println (Container1.tostring ()); Jsonobject ClassInfo=NewJsonobject (); Classinfo.put ("Stucount", 50); Classinfo.put ("Leader", "RAH"); Container1.put ("ClassInfo", ClassInfo);                System.out.println (Container1); Jsonobject ClassInfo=NewJsonobject (); Jsonarray Stucount=NewJsonarray (); Stucount.add (50); Jsonarray leader=NewJsonarray (); Leader.add ("Rah"); Classinfo.put ("Stucount", Stucount); Classinfo.put ("Leader", leader); Container1.put ("ClassInfo", ClassInfo);                System.out.println (Container1); Jsonarray Students=NewJsonarray (); Jsonobject Studentone=NewJsonobject (); Studentone.put ("Name", "Mace"); Studentone.put ("Sex", "male"); Studentone.put ("Age", 12); Studentone.put ("Hobby", "Java Develop"); Jsonobject Studenttwo=NewJsonobject (); Studenttwo.put ("Name", "King Lame"); Studenttwo.put ("Sex", "male"); Studenttwo.put ("Age", 13); Studenttwo.put ("Hobby", "c/C + + develop");        Students.add (Studentone);        Students.add (Studenttwo); Container1.put ("Students", students);                System.out.println (Container1); Jsonarray Students=NewJsonarray (); Jsonobject Studnetone=NewJsonobject (); Jsonarray name1=NewJsonarray (); Name1.add ("Mace"); Jsonarray sex1=NewJsonarray (); Sex1.add (Male); Jsonarray Age1=NewJsonarray (); Age1.add ("12"); Jsonarray hobby1=NewJsonarray (); Hobby1.add ("Java Develop"); Studnetone.put ("Name", name1); Studnetone.put ("Sex", SEX1); Studnetone.put ("Age", Age1); Studnetone.put ("Hobby", hobby1); Jsonobject Studnettwo=NewJsonobject (); Jsonarray name2=NewJsonarray (); Name2.add ("The King Lame"); Jsonarray Sex2=NewJsonarray (); Sex2.add (Male); Jsonarray Age2=NewJsonarray (); Age2.add ("13"); Jsonarray hobby2=NewJsonarray (); Hobby2.add ("C-Develop"); Studnettwo.put ("Name", name2); Studnettwo.put ("Sex", SEX2); Studnettwo.put ("Age", Age2); Studnettwo.put ("Hobby", hobby2);        Students.add (Studnetone);        Students.add (Studnettwo); Container1.put ("Students", Students);                System.out.println (Container1); Jsonarray Teachers=NewJsonarray (); Teachers.add (0, "Miss Wang"); Teachers.add (1, "Miss Li"); Container1.put ("Teachers", teachers);                System.out.println (Container1); Jsonarray Teachers=NewJsonarray (); Jsonobject Teacher1=NewJsonobject (); Teacher1.put ("Name", "Xiao Mei"); Teacher1.put ("Introduce", "he's a good teacher."); Jsonobject Teacher2=NewJsonobject (); Teacher2.put ("Name", "Xiao Li"); Teacher2.put ("Introduce", "he's a qualified teacher."); Teachers.add (0, Teacher1); Teachers.add (1, Teacher2); Container1.put ("Teachers", Teachers);    System.out.println (Container1); }}

Operation Result:

{"ClassName": "31 class High"}{"ClassName": "Gao 31 class", "ClassName": ["high 31 classes"]}{"ClassName": "Gao 31 class", "ClassName": ["high 31 classes"], "ClassInfo": {"Stucount": "Leader": "RAH"}}{"ClassName": "High Class 31", "ClassName": ["high 31 classes"], "ClassInfo": {"Stucount": "Leader", "" "" Rah "," ClassInfo ": {" Stucount ", [50 ], "leader": ["RAH"]}}{"ClassName": "High Class 31", "ClassName": ["high 31 classes"], "ClassInfo": {"Stucount": "Leader", "" "" Rah "," ClassInfo ": {" Stucount ", [50 ], "leader": ["rah"]}, "Students": [{"Name": "Mace", "Sex": "Male", "Age": "Hobby": "Java Develop"},{"name": "King Cripple", "Sex": "Male "," Age ":" Hobby ":" C-Develop "}]}{"ClassName": "High Class 31", "ClassName": ["high 31 classes"], "ClassInfo": {"Stucount": "Leader", "" "" Rah "," ClassInfo ": {" Stucount ", [50 ], "leader": ["rah"]}, "Students": [{"Name": "Mace", "Sex": "Male", "Age": "Hobby": "Java Develop"},{"name": "King Cripple", "Sex": "Male "," Age ":" Hobby ":" C + + Develop "}]," Students ": [{" Name ": [" Mace "]," sex ": [" male "]," age ": [" ["]," hobby ": [" Java Develop "]},{" name ": [" King Cripple "]," sex ": [" male "]," age ": ["], "" Hobby ": [" C + + Develop "]}]}{"ClassName": "High Class 31", "ClassName": ["high 31 classes"], "ClassInfo": {"Stucount": "Leader", "" "" Rah "," ClassInfo ": {" Stucount ", [50 ], "leader": ["rah"]}, "Students": [{"Name": "Mace", "Sex": "Male", "Age": "Hobby": "Java Develop"},{"name": "King Cripple", "Sex": "Male "," Age ":" Hobby ":" C + + Develop "}]," Students ": [{" Name ": [" Mace "]," sex ": [" male "]," age ": [" ["]," hobby ": [" Java Develop "]},{" name ": [" The King Lame "]," sex ": [" male "]," age ": [" "]," hobby ": [" C + + Develop "]}]," Teachers ": [" Miss Wang "," Miss Li "]}{"ClassName": "High Class 31", "ClassName": ["high 31 classes"], "ClassInfo": {"Stucount": "Leader", "" "" Rah "," ClassInfo ": {" Stucount ", [50 ], "leader": ["rah"]}, "Students": [{"Name": "Mace", "Sex": "Male", "Age": "Hobby": "Java Develop"},{"name": "King Cripple", "Sex": "Male "," Age ":" Hobby ":" C + + Develop "}]," Students ": [{" Name ": [" Mace "]," sex ": [" male "]," age ": [" ["]," hobby ": [" Java Develop "]},{" name ": [" King Lame "]," sex ": [" male "]," age ": [" ["]," hobby ": [" C + + Develop "]}]," Teachers ": [" Miss Wang "," Miss Li "]," teachers ": [{ "Name": "Xiao Mei", "introduce": "He is a good teacher"},{"name": "Xiao Li", "introduce": "He is a qualified teacher"}]}

Iv. iterating through the JSON instance

The JSON string for the above output is sequentially traversed

String ClassName1 = (string) container1.get ("ClassName"); System.out.println ("ClassName data is:" +ClassName1); Jsonarray className1= Container1.getjsonarray ("ClassName"); System.out.println ("ClassName data is:" +className1); Jsonobject ClassInfo1= Container1.getjsonobject ("ClassInfo"); System.out.println ("ClassInfo data is:" +classInfo1); Jsonobject ClassInfo1= Container1.getjsonobject ("ClassInfo"); System.out.println ("ClassInfo data is:" +ClassInfo1); Jsonarray Students1= Container1.getjsonarray ("Students"); System.out.println ("Students data is:" +students1); Jsonarray Students1= Container1.getjsonarray ("Students"); System.out.println ("Students data is:" +Students1); Jsonarray teachers1= Container1.getjsonarray ("Teachers");  for(inti=0; I < teachers1.size (); i++) {System.out.println ("Teahcer" + i + "is:" +Teachers1.get (i)); } Jsonarray Teachers1= Container1.getjsonarray ("Teachers");  for(inti=0; I < teachers1.size (); i++) {System.out.println ("Teachers" + i + "is:" +Teachers1.get (i)); }

Traversal results:

ClassName data is: High 31 class ClassName data is: ["high Class 31"]classinfo data is: {"Stucount": "Leader": "RAH" }classinfo data is: {"stucount": [[A], "leader": ["RAH"]}students data is: [{"name": "Mace", "Sex": "Male", " Age ":" Hobby ":" Java Develop "},{" name ":" King Lame "," sex ":" Male "," Age ":" Hobby ":" C + + develop "}]students data is: [{ "Name": ["Mace"], "sex": ["male"], "age": ["["], "hobby": ["Java Develop"]},{"name": ["King Cripple"], "sex": ["male"], "age": ["13"], " Hobby ": [" C/S++Develop "0 1 0 is: {" name ":" Xiao Mei "," introduce ":" Heis a good teacher "1 is: {" name ": "Xiao Li", "introduce": "He is a qualified teacher"}

The above includes most of the nested forms of JSON, may be ignored can also refer to the above content.

The use of JSON objects in Java

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.