想将数据保存为这样子：

[{

"subject": {

"code": "B123",

"words": [{

"key": "gjc1",

"wight": 9.8,

"ct": 1575126920

}, {

"key": "gjc1",

"wight": 9.8,

"ct": 1575126920

}, {

"key": "gjc1",

"wight": 9.8,

"ct": 1575126920

}],

"wight": 3,

"ct": 1575126920

}

}, {

"subject": {

"code": "C456",

"words": [{

"key": "gjc1",

"wight": 9.8,

"ct": 1575126920

}, {

"key": "gjc1",

"wight": 9.8,

"ct": 1575126920

}, {

"key": "gjc1",

"wight": 9.8,

"ct": 1575126920

}],

"wight": 3,

"ct": 1575126920

}

}

]

转换为Java后，如：

/**

* Copyright 2019 bejson.com

*/

package com.besjon.pojo;

/**

* Auto-generated: 2019-11-30 23:24:14

*

* @author bejson.com (i@bejson.com)

* @website http://www.bejson.com/java2pojo/

*/

public class JsonRootBean {

private Subject subject;

public void setSubject(Subject subject) {

this.subject = subject;

}

public Subject getSubject() {

return subject;

}

}

/**

* Copyright 2019 bejson.com

*/

package com.besjon.pojo;

import java.util.List;

/**

* Auto-generated: 2019-11-30 23:24:14

*

* @author bejson.com (i@bejson.com)

* @website http://www.bejson.com/java2pojo/

*/

public class Subject {

private String code;

private List words;

private int wight;

private long ct;

public void setCode(String code) {

this.code = code;

}

public String getCode() {

return code;

}

public void setWords(List words) {

this.words = words;

}

public List getWords() {

return words;

}

public void setWight(int wight) {

this.wight = wight;

}

public int getWight() {

return wight;

}

public void setCt(long ct) {

this.ct = ct;

}

public long getCt() {

return ct;

}

}

/**

* Copyright 2019 bejson.com

*/

package com.besjon.pojo;

/**

* Auto-generated: 2019-11-30 23:24:14

*

* @author bejson.com (i@bejson.com)

* @website http://www.bejson.com/java2pojo/

*/

public class Words {

private String key;

private double wight;

private long ct;

public void setKey(String key) {

this.key = key;

}

public String getKey() {

return key;

}

public void setWight(double wight) {

this.wight = wight;

}

public double getWight() {

return wight;

}

public void setCt(long ct) {

this.ct = ct;

}

public long getCt() {

return ct;

}

}

直此，完成！！！