从前台获取了一个xml,然后解析xml的属性的时候,其属性值是一个json的String类型.所以在解析json的时候,给出的问题是:
1,不管什么对象类型,根据json的构造,根据的key值,去取对应的value值;
2,将操作的json的对象,定义为对应的java对象,然后将json转换为对应的java对象.取java对象的属性值,即是处理的结果值.
两种不同的思路,性能和可维护性上面,个人感觉还是后者相对方便一点..贴下代码,看看...
第一种方式::
其json的直观视觉是:
package azkabanproject;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
public class ParseJsonString {
public static void main(String[] args) {
String jsonString = "{\n" +
" \"sources\":[\n" +
" {\n" +
" \"baseList\":{\n" +
" \"tableName\":\"trs_action_dzwl_zm1\",\n" +
" \"tableAlias\":\"50\",\n" +
" \"tableSize\":\"10000\",\n" +
" \"tableFields\":[\n" +
" {\n" +
" \"field\":\"name1\",\n" +
" \"fieldDesc\":\"名称1\",\n" +
" \"fieldInputtype\":\"0\"\n" +
" },\n" +
" {\n" +
" \"field\":\"name2\",\n" +
" \"fieldDesc\":\"名称2\",\n" +
" \"fieldInputtype\":\"1\"\n" +
" }\n" +
" ]\n" +
" },\n" +
" \"infoList\":[\n" +
" {\n" +
" \"field\":\"start_time\",\n" +
" \"fieldContent\":\"20170724000000到20170724101010\",\n" +
" \"fieldDesc\":\"创建时间\"\n" +
" },\n" +
" {\n" +
" \"field\":\"site_address\",\n" +
" \"fieldContent\":\"南苑大厦\",\n" +
" \"fieldDesc\":\"详细地址\"\n" +
" },\n" +
" {\n" +
" \"field\":\"name\",\n" +
" \"fieldContent\":\"自定义名称1\",\n" +
" \"fieldDesc\":\"名称\"\n" +
" }\n" +
" ]\n" +
" },\n" +
" {\n" +
" \"baseList\":{\n" +
" \"tableName\":\"trs_action_dzwl_zm1\",\n" +
" \"tableAlias\":\"50\",\n" +
" \"tableSize\":\"10000\",\n" +
" \"tableFields\":[\n" +
" {\n" +
" \"field\":\"name1\",\n" +
" \"fieldDesc\":\"名称1\",\n" +
" \"fieldInputtype\":\"0\"\n" +
" },\n" +
" {\n" +
" \"field\":\"name2\",\n" +
" \"fieldDesc\":\"名称2\",\n" +
" \"fieldInputtype\":\"1\"\n" +
" }\n" +
" ]\n" +
" },\n" +
" \"infoList\":[\n" +
" {\n" +
" \"field\":\"start_time\",\n" +
" \"fieldContent\":\"20170724000000到20170724101010\",\n" +
" \"fieldDesc\":\"创建时间\"\n" +
" },\n" +
" {\n" +
" \"field\":\"site_address\",\n" +
" \"fieldContent\":\"南苑大厦\",\n" +
" \"fieldDesc\":\"详细地址\"\n" +
" },\n" +
" {\n" +
" \"field\":\"name\",\n" +
" \"fieldContent\":\"自定义名称1\",\n" +
" \"fieldDesc\":\"名称\"\n" +
" }\n" +
" ]\n" +
" }\n" +
" ],\n" +
" \"outFields\":[\n" +
" {\n" +
" \"field\":\"name1\",\n" +
" \"fieldDesc\":\"名称1\",\n" +
" \"fieldInputtype\":\"0\"\n" +
" },\n" +
" {\n" +
" \"field\":\"name2\",\n" +
" \"fieldDesc\":\"名称2\",\n" +
" \"fieldInputtype\":\"1\"\n" +
" }\n" +
" ]\n" +
" }";
parse(jsonString);
}
public static void parse(String jsonString) {
// String jsonString = "";
Gson json = new Gson();
JsonObject jsb = json.fromJson(jsonString, JsonObject.class);
JsonArray sources = jsb.getAsJsonArray("sources"); //数组
for (JsonElement ja : sources) {
JsonElement jba = ja.getAsJsonObject().get("baseList");
String tableName = jba.getAsJsonObject().get("tableName").getAsString();
String tableAlias = jba.getAsJsonObject().get("tableAlias").getAsString();
String tableSize = jba.getAsJsonObject().get("tableSize").getAsString();
System.out.println(tableName+"___"+tableAlias+"___"+tableSize);
JsonArray tableFields = jba.getAsJsonObject().get("tableFields").getAsJsonArray();
for (JsonElement tableField : tableFields) {
String field = tableField.getAsJsonObject().get("field").getAsString();
String fieldDesc = tableField.getAsJsonObject().get("fieldDesc").getAsString();
String fieldInputtype = tableField.getAsJsonObject().get("fieldInputtype").getAsString();
System.out.println(field+"___"+fieldDesc+"___"+fieldInputtype);
}
JsonArray infoList = ja.getAsJsonObject().get("infoList").getAsJsonArray();
for (JsonElement info : infoList) {
String field = info.getAsJsonObject().get("field").getAsString();
String fieldContent = info.getAsJsonObject().get("fieldContent").getAsString();
String fieldDesc = info.getAsJsonObject().get("fieldDesc").getAsString();
System.out.println(field+"___"+fieldContent+"___"+fieldDesc);
}
}
JsonArray outFields = jsb.getAsJsonArray("outFields");
for (JsonElement outField : outFields) {
String field= outField.getAsJsonObject().get("field").getAsString();
String fieldDesc= outField.getAsJsonObject().get("fieldDesc").getAsString();
String fieldInputtype=outField.getAsJsonObject().get("fieldInputtype").getAsString();
System.out.println(field+"___"+fieldDesc+"___"+fieldInputtype);
}
}
}
以上是第一种方式,使用的是Gson,然后根据json结构直接操作json数据类型.
第二种是:构建对象
对象JsonValue
package com.trs.idap.web.rest.util;
import java.io.Serializable;
import java.util.Arrays;
/**
* Created by Administrator on 2018/7/25.
* 描述:
* @author Young
* @create 2018-07-25 17:44
*/
public class JsonValue implements Serializable{
private BaseInfo[] sources;
private OutFields[] outFields;
@Override
public String toString() {
return "JsonValue{" +
"sources=" + Arrays.toString(sources) +
", outFields=" + Arrays.toString(outFields) +
'}';
}
public OutFields[] getOutFields() {
return outFields;
}
public void setOutFields(OutFields[] outFields) {
this.outFields = outFields;
}
public BaseInfo[] getSources() {
return sources;
}
public void setSources(BaseInfo[] sources) {
this.sources = sources;
}
}
对象BaseInfo
package com.trs.idap.web.rest.util;
import java.io.Serializable;
import java.util.Arrays;
/**
* Created by Administrator on 2018/7/25.
* 描述:
*
* @author Young
* @create 2018-07-25 17:47
*/
public class BaseInfo implements Serializable{
private BaseList baseList;
private InfoList[] infoList;
//TODO getter/setter/toString
}
对象BaseList
package com.trs.idap.web.rest.util;
import java.io.Serializable;
import java.util.Arrays;
/**
* Created by Administrator on 2018/7/25.
* 描述:
*
* @author Young
* @create 2018-07-25 17:59
*/
public class BaseList implements Serializable{
private String tableName;
private String tableNameDesc;
private String tableAlias;
private String tableSize;
private TableFields[] tableFields;
//TODO setter getter toString
}
对象 TableFields
package com.trs.idap.web.rest.util;
import java.io.Serializable;
/**
* Created by Administrator on 2018/7/25.
* 描述:
*
* @author Young
* @create 2018-07-25 18:02
*/
public class TableFields implements Serializable{
private String field;
private String fieldDesc;
private String fieldInputtype;
//TODO setter getter toString
}
对象InfoList
package com.trs.idap.web.rest.util;
import java.io.Serializable;
/**
* Created by Administrator on 2018/7/25.
* 描述:
*
* @author Young
* @create 2018-07-25 18:04
*/
public class InfoList implements Serializable {
private String field;
private String fieldContent;
private String fieldDesc;
//TODO getter setter toString
}
对象OutFields
package com.trs.idap.web.rest.util;
import java.io.Serializable;
/**
* Created by Administrator on 2018/7/25.
* 描述:
*
* @author Young
* @create 2018-07-25 17:55
*/
public class OutFields implements Serializable {
private String field;
private String fieldDesc;
private String fieldInputtype;
//TODO getter setter toString
}
由上图可见.....该json总共建立了6个java对象.但是对于后期的维护性还是比较方便的....
使用方法解析时:
package com.trs.idap.web.rest.util;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
/**
* Created by Administrator on 2018/7/25.
* 描述:解析json格式
*
* @author Young
* @create 2018-07-25 17:07
*/
public class JsonUtils {
public static void main(String[] args) throws IOException {
ObjectMapper mapper = new ObjectMapper();
JsonValue jsonValue = mapper.readValue(jsonString, JsonValue.class);
OutFields[] outFields = jsonValue.getOutFields();
//字段值,字段 ===>columnList columnListComment
StringBuffer sbFieldList = new StringBuffer();
StringBuffer sbFieldListComment = new StringBuffer();
Boolean flag = false;
for (OutFields outField : outFields) {
System.err.println(outField.getField());
System.out.println(outField.getFieldDesc());
System.out.println(outField.getFieldInputtype());
if (!flag) {
sbFieldList.append(outField.getField());
sbFieldListComment.append(outField.getFieldDesc());
flag = true;
} else {
sbFieldList.append(",").append(outField.getField());
sbFieldListComment.append(",").append(outField.getFieldDesc());
}
}
System.out.println("字段列为:======>" + sbFieldList.toString() + ", 字段名为===:" + sbFieldListComment);
BaseInfo[] sources = jsonValue.getSources();
for (BaseInfo baseInfo : sources) {
BaseList baseList = baseInfo.getBaseList();
System.out.println(baseList.getTableAlias());
System.out.println(baseList.getTableFields());
System.out.println(baseList.getTableName());
System.out.println(baseList.getTableNameDesc());
System.out.println(baseList.getTableSize());
InfoList[] infoList = baseInfo.getInfoList();
for (InfoList info : infoList) {
System.out.println(info.getField());
System.out.println(info.getFieldContent());
System.out.println(info.getFieldDesc());
}
}
}
}
真正使用的就是获取到指定的类型
ObjectMapper mapper = new ObjectMapper();
JsonValue jsonValue = mapper.readValue(jsonString, JsonValue.class);构建起来还很方便的..只要将对象关系处理好.