Conversion between objects and json in java

Sometimes object data will be converted into json data for project needs. The following is a personal implementation method based on project needs.

Convert json string to java object

Similarly convert the json string to json object first, and then convert the json object to java Object as shown below.

JSONObject obj = new JSONObject().fromObject(jsonStr);//Convert json string to json object

Convert json object to java Object

Person jb = (Person)JSONObject.toBean(obj,Person.class);//Convert the json object to a Person object

Convert java object to json string

Convert java object to json object first, then convert json object to json string

JSONObject json = JSONObject.fromObject(obj);//Convert java object to json object

String str = json.toString();//Convert json object to string

The data format needs to be used in the project:

[{"node": "0",   "index": null,"status": null,"preNode": null,"postNode": [{"node": "xxx_4"},
    {"node": "xxx_3"},
    {"node": "xxx_2"},
    {"node": "xxx_14"}]
},
{"node": "xxx_2","index": "index_1","status": "表达式1","preNode": [{"node": "xxx_0"}],"postNode": [{"node": "xxx_5"}]
},
{"node": "xxx_14","index": "index_4","status": "表达式5","preNode": [{"node": "xxx_0"}],"postNode": [{"node": "xxx_13"},
    {"node": "xxx_5"}]
},
{"node": "xxx_3","index": "index_2","status": "表达式2","preNode": [{"node": "xxx_0"}],"postNode": [{"node": "xxx_5"}]
},
{"node": "xxx_4","index": "index_3","status": "表达式3","preNode": [{"node": "xxx_0"}],"postNode": [{"node": "xxx_12"}]
},
{"node": "xxx_5","index": "index_4","status": "表达式4","preNode": [{"node": "xxx_3"},
    {"node": "xxx_2"},
    {"node": "xxx_14"}],"postNode": [{"node": "xxx_6"}]
},
{"node": "xxx_6","index": "index_5","status": "表达式6","preNode": [{"node": "xxx_5"}],"postNode": [{"node": "xxx_7"}]
},
{"node": "xxx_7","index": "index_6","status": "表达式7","preNode": [{"node": "xxx_6"}],"postNode": [{"node": "xxx_8"}]
},
{"node": "xxx_8","index": "index_4","status": "表达式8","preNode": [{"node": "xxx_7"}],"postNode": [{"node": "xxx_9"},
    {"node": "xxx_10"}]
},
{"node": "xxx_9","index": "index_5","status": "表达式5","preNode": [{"node": "xxx_8"}],"postNode": [{"node": "xxx_11"}]
},
{"node": "xxx_10","index": "index_7","status": "表达式6","preNode": [{"node": "xxx_8"}],"postNode": [{"node": "xxx_11"}]
},
{"node": "xxx_11","index": "index_8","status": "表达式7","preNode": [{"node": "xxx_9"},
    {"node": "xxx_10"}],"postNode": [{"node": "xxx_12"}]
},
{"node": "xxx_12","index": "index_8","status": "表达式7","preNode": [{"node": "xxx_11"},
    {"node": "xxx_4"}],"postNode": [{"node": "xxx_13"}]
},
{"node": "xxx_13","index": "","status": "","preNode": [{"node": "xxx_14"},
    {"node": "xxx_12"}],"postNode": []
},
{"node": "9999","index": null,"status": null,"preNode": [{"node": "xxx_14"},
    {"node": "xxx_12"}],"postNode": null}]

The content of the list object in the project

 1 JsonModel{node='xxx_2', preNode='', index='index_1', status='表达式1'} 2 JsonModel{node='xxx_14', preNode='', index='index_4', status='表达式5'} 3 JsonModel{node='xxx_3', preNode='', index='index_2', status='表达式2'} 4 JsonModel{node='xxx_4', preNode='', index='index_3', status='表达式3'} 5 JsonModel{node='xxx_5', preNode='xxx_2', index='index_4', status='表达式4'} 6 JsonModel{node='xxx_5', preNode='xxx_3', index='index_4', status='表达式5'} 7 JsonModel{node='xxx_5', preNode='xxx_14', index='index_4', status='表达式5'} 8 JsonModel{node='xxx_6', preNode='xxx_5', index='index_5', status='表达式6'} 9 JsonModel{node='xxx_7', preNode='xxx_6', index='index_6', status='表达式7'}10 JsonModel{node='xxx_8', preNode='xxx_7', index='index_4', status='表达式8'}11 JsonModel{node='xxx_9', preNode='xxx_8', index='index_5', status='表达式5'}12 JsonModel{node='xxx_10', preNode='xxx_8', index='index_7', status='表达式6'}13 JsonModel{node='xxx_11', preNode='xxx_10', index='index_8', status='表达式7'}14 JsonModel{node='xxx_11', preNode='xxx_9', index='index_8', status='表达式8'}15 JsonModel{node='xxx_12', preNode='xxx_11', index='index_8', status='表达式7'}16 JsonModel{node='xxx_12', preNode='xxx_4', index='index_8', status='表达式8'}17 JsonModel{node='xxx_13', preNode='xxx_14', index='', status='表达式13'}18 JsonModel{node='xxx_13', preNode='xxx_12', index='', status='表达式14'}

  testJson() <JsonModel> list= ArrayList<>== JsonModel("xxx_2","","index_1","表达式1"= JsonModel("xxx_14","","index_4","表达式5"= JsonModel("xxx_3","","index_2","表达式2"= JsonModel("xxx_4","","index_3","表达式3"= JsonModel("xxx_5","xxx_2","index_4","表达式4"= JsonModel("xxx_5","xxx_3","index_4","表达式5"= JsonModel("xxx_5","xxx_14","index_4","表达式5"= JsonModel("xxx_6","xxx_5","index_5","表达式6"= JsonModel("xxx_7","xxx_6","index_6","表达式7"= JsonModel("xxx_8","xxx_7","index_4","表达式8"= JsonModel("xxx_9","xxx_8","index_5","表达式5"= JsonModel("xxx_10","xxx_8","index_7","表达式6"= JsonModel("xxx_11","xxx_10","index_8","表达式7"= JsonModel("xxx_11","xxx_9","index_8","表达式8"= JsonModel("xxx_12","xxx_11","index_8","表达式7"= JsonModel("xxx_12","xxx_4","index_8","表达式8"= JsonModel("xxx_13","xxx_14","","表达式13"= JsonModel("xxx_13","xxx_12","","表达式14"->String str=JsonNode rootNode =<ChildNode> preNode_set=<ChildNode> postNode_set=<Node> nodeList= ArrayList<>Node node="0"<ChildNode> childNodeList= HashSet<>( i=0;i<rootNode.size();i++("".equals(rootNode.get(i).get("preNode" ChildNode(rootNode.get(i).get("node" ( i=0;i<= HashSet<>= HashSet<>JsonNode nameNode = (rootNode.get(i)).get("node"==rootNode.get(i).get("index"=rootNode.get(i).get("status"( j=i+1;j<rootNode.size();j++= (rootNode.get(j)).get("preNode"postNode_set.add( ChildNode((rootNode.get(j)).get("node"( j=0;j<list.size();j++= (rootNode.get(j)).get("node"(!"".equals(rootNode.get(j).get("preNode" ChildNode((rootNode.get(j)).get("preNode"(j>++++ ChildNode("0"++=Node pre_node="9999"<ChildNode> childNodes= HashSet<>( i=0;i<rootNode.size();i++("".equals(rootNode.get(i).get("index" ChildNode(rootNode.get(i).get("preNode"=  jsonTest(String s) <Node> nodeList= ArrayList<>==<JsonModel> jsonModels= ArrayList<>( i=1;i<jsonNode.size()-1;i++=jsonNode.get(i).get("index"=jsonNode.get(i).get("status"=jsonNode.get(i).get("node"( j=0;j<jsonNode.get(i).get("preNode").size();j++= jsonNode.get(i).get("preNode").get(j).get("node"=->

The following are the object entity classes used

 1 package com.yf.af.biz.test; 2  3 /** 4  * Created by chen on 2017/7/14. 5  */ 6 public class JsonModel { 7     private String node; 8     private String preNode; 9     private String index;10     private String status;11 12     public String getNode() {13         return node;14     }15 16     public void setNode(String node) {17         this.node = node;18     }19 20     public String getPreNode() {21         return preNode;22     }23 24     public void setPreNode(String preNode) {25         this.preNode = preNode;26     }27 28     public String getIndex() {29         return index;30     }31 32     public void setIndex(String index) {33         this.index = index;34     }35 36     public String getStatus() {37         return status;38     }39 40     public void setStatus(String status) {41         this.status = status;42     }43 44     public JsonModel(String node, String preNode, String index, String status) {45         this.node = node;46         this.preNode = preNode;47         this.index = index;48         this.status = status;49     }50 51     public JsonModel() {52     }53 54     @Override55     public String toString() {56         return "JsonModel{" +57                 "node='" + node + '\'' +58                 ", preNode='" + preNode + '\'' +59                 ", index='" + index + '\'' +60                 ", status='" + status + '\'' +61                 '}';62     }63 }

View Code

 1 package com.yf.af.biz.test; 2  3 import java.util.List; 4 import java.util.Set; 5  6 /** 7  * Created by chen on 2017/7/15. 8  */ 9 public class Node {10     private String node;11     private String index;12     private String status;13 14     private Set<ChildNode> preNode;15 16     private Set<ChildNode> postNode;17 18     public String getNode() {19         return node;20     }21 22     public void setNode(String node) {23         this.node = node;24     }25 26     public String getIndex() {27         return index;28     }29 30     public void setIndex(String index) {31         this.index = index;32     }33 34     public String getStatus() {35         return status;36     }37 38     public void setStatus(String status) {39         this.status = status;40     }41 42     public Set<ChildNode> getPreNode() {43         return preNode;44     }45 46     public void setPreNode(Set<ChildNode> preNode) {47         this.preNode = preNode;48     }49 50     public Set<ChildNode> getPostNode() {51         return postNode;52     }53 54     public void setPostNode(Set<ChildNode> postNode) {55         this.postNode = postNode;56     }57 58     @Override59     public String toString() {60         return "Node{" +61                 "node='" + node + '\'' +62                 ", index='" + index + '\'' +63                 ", status='" + status + '\'' +64                 ", preNode=" + preNode +65                 ", postNode=" + postNode +66                 '}';67     }68 69 70     public Node() {71     }72 }

View Code

 1 package com.yf.af.biz.test; 2  3 /** 4  * Created by chen on 2017/7/15. 5  */ 6 public class ChildNode { 7     private String node; 8  9     public String getNode() {10         return node;11     }12 13     public void setNode(String node) {14         this.node = node;15     }16 17     public ChildNode(String node) {18         this.node = node;19     }20 21     public ChildNode() {22     }23 }

View Code

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