Java 如何使用camel-jackson将JSONArray转换为对象列表
我的json数组字符串如下Java 如何使用camel-jackson将JSONArray转换为对象列表,java,json,jackson,apache-camel,Java,Json,Jackson,Apache Camel,我的json数组字符串如下 {"Compemployes":[ { "id":1001, "name":"jhon" }, { "id":1002, "name":"jhon" } ]} 我想将此jsonarray转换为列表。为此,我添加了maven依赖项“camel-jackson”,并为employee编写了pojo类。但是当我尝试运行下面的代码时 Ob
{"Compemployes":[
{
"id":1001,
"name":"jhon"
},
{
"id":1002,
"name":"jhon"
}
]}
我想将此jsonarray转换为列表
。为此,我添加了maven依赖项“camel-jackson
”,并为employee编写了pojo类。但是当我尝试运行下面的代码时
ObjectMapper mapper = new ObjectMapper();
List<Employe> list = mapper.readValue(jsonString, TypeFactory.collectionType(List.class, Employe.class));
有人能告诉我我遗漏了什么或做错了什么吗?问题不在你的代码中,而在你的json中:
{"Compemployes":[{"id":1001,"name":"jhon"}, {"id":1002,"name":"jhon"}]}
这表示包含Compemployes属性的对象,Compemployes属性是
雇员。在这种情况下,您应该创建如下对象:
class EmployeList{
private List<Employe> compemployes;
(with getter an setter)
}
如果您的json应直接表示员工列表,则应如下所示:
[{"id":1001,"name":"jhon"}, {"id":1002,"name":"jhon"}]
最后一句话:
List<Employee> list2 = mapper.readValue(jsonString,
TypeFactory.collectionType(List.class, Employee.class));
/*
这一问题已得到答复http://stackoverflow.com/questions/15609306/convert-string-to-json-array/33292260#33292260
*将字符串放入文件jsonFileArr.json中
*[{“用户名”:“你好”,“电子邮件”:”hello@email.com“,”学分“
*:“100”,“twitter_用户名”:“},
*{“用户名”:“再见”,“电子邮件”:goodbye@email.com"
*,“信用”:“0”,“twitter_用户名”:“},
*{“用户名”:“mlsilva”,“电子邮件”:mlsilva@email.com"
*,“信用”:“524”,“twitter_用户名”:“},
*{“用户名”:“fsouza”,“电子邮件”:fsouza@email.com"
*,“信用”:“1052”,“twitter_用户名”:“}]
*/
公共类TestaGsonLista{
公共静态void main(字符串[]args){
Gson Gson=新的Gson();
试一试{
BufferedReader br=新的BufferedReader(新文件读取器(
“C:\\Temp\\jsonfilear.json”);
JsonArray JsonArray=new-JsonParser().parse(br).getAsJsonArray();
for(int i=0;i
我在JSON输出格式方面也遇到了类似的问题。这段代码适用于上述JSON格式
package com.test.ameba;
import java.util.List;
public class OutputRanges {
public List<Range> OutputRanges;
public String Message;
public String Entity;
/**
* @return the outputRanges
*/
public List<Range> getOutputRanges() {
return OutputRanges;
}
/**
* @param outputRanges the outputRanges to set
*/
public void setOutputRanges(List<Range> outputRanges) {
OutputRanges = outputRanges;
}
/**
* @return the message
*/
public String getMessage() {
return Message;
}
/**
* @param message the message to set
*/
public void setMessage(String message) {
Message = message;
}
/**
* @return the entity
*/
public String getEntity() {
return Entity;
}
/**
* @param entity the entity to set
*/
public void setEntity(String entity) {
Entity = entity;
}
}
package com.test;
public class Range {
public String Name;
/**
* @return the name
*/
public String getName() {
return Name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
Name = name;
}
public Object[] Value;
/**
* @return the value
*/
public Object[] getValue() {
return Value;
}
/**
* @param value the value to set
*/
public void setValue(Object[] value) {
Value = value;
}
}
package com.test.ameba;
import java.io.IOException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JSONTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String jsonString ="{\"OutputRanges\":[{\"Name\":\"ABF_MEDICAL_RELATIVITY\",\"Value\":[[1.3628407124839714]]},{\"Name\":\" ABF_RX_RELATIVITY\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_Unique_ID_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_FIRST_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_AMEBA_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_Effective_Date_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_AMEBA_MODEL\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_UC_ER_COPAY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_INN_OON_DED_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_COINSURANCE_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_PCP_SPEC_COPAY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_INN_OON_OOP_MAX_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_IP_OP_COPAY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_PHARMACY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_PLAN_ADMIN_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]}],\"Message\":\"\",\"Entity\":null}";
ObjectMapper mapper = new ObjectMapper();
OutputRanges OutputRanges=null;
try {
OutputRanges = mapper.readValue(jsonString, OutputRanges.class);
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("OutputRanges :: "+OutputRanges);;
System.out.println("OutputRanges.getOutputRanges() :: "+OutputRanges.getOutputRanges());;
for (Range r : OutputRanges.getOutputRanges()) {
System.out.println(r.getName());
}
}
}
package com.test.ameba;
导入java.util.List;
公共类输出范围{
公共列表输出范围;
公共字符串消息;
公共字符串实体;
/**
*@返回输出范围
*/
公共列表getOutputRanges(){
返回输出范围;
}
/**
*@param outputRanges要设置的输出范围
*/
public void setOutputRanges(列出outputRanges){
输出范围=输出范围;
}
/**
*@回信
*/
公共字符串getMessage(){
返回消息;
}
/**
*@param message要设置的消息
*/
公共无效设置消息(字符串消息){
消息=消息;
}
/**
*@返回实体
*/
公共字符串getEntity(){
返回实体;
}
/**
*@param entity要设置的实体
*/
公共void集合实体(字符串实体){
实体=实体;
}
}
包com.test;
公共类范围{
公共字符串名称;
/**
*@返回名称
*/
公共字符串getName(){
返回名称;
}
/**
*@param name要设置的名称
*/
公共void集合名(字符串名){
名称=名称;
}
公共对象[]值;
/**
*@返回值
*/
公共对象[]getValue(){
返回值;
}
/**
*@param value要设置的值
*/
public void setValue(对象[]值){
价值=价值;
}
}
包com.test.ameba;
导入java.io.IOException;
导入com.fasterxml.jackson.core.JsonParseException;
导入com.fasterxml.jackson.databind.JsonMappingException;
导入com.fasterxml.jackson.databind.ObjectMapper;
公共类JSONTest{
/**
*@param args
*/
公共静态void main(字符串[]args){
//TODO自动生成的方法存根
字符串JSon字符串字符串jsonString=“{“OutputRanges\”:[““名称”名称::“ABF医学-医学-医学-医学-医学-医学-医学-医学-医学-医学-医学-医学-相关”的,”数值:“:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,1,1.1.1.1.1.1.5,1.5,1.5,2,2,2,2,2,2.5,2.5,2.5,2.5,2.5,2.5,2.5,2.5,2.5,5,5,5,3.5,3.5,3.5,3,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,3]]},{\'Name\':\'ABF\u FIRST\u ERR\',\'Value\':[[\'CPD\',\'“姓名:”:,“姓名”姓名::“阿布f·阿米巴·阿米巴·阿米巴·厄尔尔”和“价值”值:“,,“价值”值:“,,,,,,,,,,,,,,,,,,“CPD\”,,“SL限”,“英特尔限,”以及“Concat\”,,1,1,1,1,1,1,1.1.1,1.5,1,2,2.5,1,2.5,1,1,2.5,2.5,2.5,5,3]]]}},,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,值\“:[[\“CPD\”,\“SL限制\”,\“Concat\”,1,1.5,2,2.5,3]},{“名称\”:”“CPD\”,“SL Li限”和“Concat\”,1,1,1.5.5,2,2.5,2.5,2.5,5.5,2.5.5,3]],,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1,1.5,2,2.5,3]},{“名称”:“ABF\U PCP\U规范\U COPAY\U ERR\”,“值”:[[“CPD\”,“SL限制”,“[姓名::“姓名:”:“ABF”的名字:::“ABF”的名字::“ABF”的名称::“ABF”的名字::“ABF”的名字:“,“价值”的“价值:”:[[“CPD”的,”1,1,1.1.5.5.5,2,2,2.2.5,2.5,2.5.5,3.5,3[3[3]]}},,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,“,”值“:[[\”CPD\“,”SL Limit\“,”Concat\”,1,1.5,2,2.5,3]},{\”名称“:”ABF\U计划管理错误\“,”值\“:[[\”CPD\“,”SL限制\“,”浓度\“,”1,1.5,2,2.5,3]}],”消息\“:\”,”实体\“:null}”;
ObjectMapper mapper=新的ObjectMapper();
OutputRanges OutputRanges=null;
试一试{
OutputRanges=mapper.readValue(jsonString,OutputRanges.class);
}捕获(JSONParsee异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}捕获(JsonMappingException e){
//TODO自动生成的捕捉块
e、 printStackTrace();
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
}
System.out.println(“OutputRanges::”+OutputRanges);;
System.out.println(“输出
List<Employee> list2 = mapper.readValue(jsonString,
TypeFactory.collectionType(List.class, Employee.class));
List<Employee> list = mapper.readValue(jsonString,
TypeFactory.defaultInstance().constructCollectionType(List.class,
Employee.class));
/*
It has been answered in http://stackoverflow.com/questions/15609306/convert-string-to-json-array/33292260#33292260
* put string into file jsonFileArr.json
* [{"username":"Hello","email":"hello@email.com","credits"
* :"100","twitter_username":""},
* {"username":"Goodbye","email":"goodbye@email.com"
* ,"credits":"0","twitter_username":""},
* {"username":"mlsilva","email":"mlsilva@email.com"
* ,"credits":"524","twitter_username":""},
* {"username":"fsouza","email":"fsouza@email.com"
* ,"credits":"1052","twitter_username":""}]
*/
public class TestaGsonLista {
public static void main(String[] args) {
Gson gson = new Gson();
try {
BufferedReader br = new BufferedReader(new FileReader(
"C:\\Temp\\jsonFileArr.json"));
JsonArray jsonArray = new JsonParser().parse(br).getAsJsonArray();
for (int i = 0; i < jsonArray.size(); i++) {
JsonElement str = jsonArray.get(i);
Usuario obj = gson.fromJson(str, Usuario.class);
//use the add method from the list and returns it.
System.out.println(obj);
System.out.println(str);
System.out.println("-------");
}
} catch (IOException e) {
e.printStackTrace();
}
}
package com.test.ameba;
import java.util.List;
public class OutputRanges {
public List<Range> OutputRanges;
public String Message;
public String Entity;
/**
* @return the outputRanges
*/
public List<Range> getOutputRanges() {
return OutputRanges;
}
/**
* @param outputRanges the outputRanges to set
*/
public void setOutputRanges(List<Range> outputRanges) {
OutputRanges = outputRanges;
}
/**
* @return the message
*/
public String getMessage() {
return Message;
}
/**
* @param message the message to set
*/
public void setMessage(String message) {
Message = message;
}
/**
* @return the entity
*/
public String getEntity() {
return Entity;
}
/**
* @param entity the entity to set
*/
public void setEntity(String entity) {
Entity = entity;
}
}
package com.test;
public class Range {
public String Name;
/**
* @return the name
*/
public String getName() {
return Name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
Name = name;
}
public Object[] Value;
/**
* @return the value
*/
public Object[] getValue() {
return Value;
}
/**
* @param value the value to set
*/
public void setValue(Object[] value) {
Value = value;
}
}
package com.test.ameba;
import java.io.IOException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JSONTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String jsonString ="{\"OutputRanges\":[{\"Name\":\"ABF_MEDICAL_RELATIVITY\",\"Value\":[[1.3628407124839714]]},{\"Name\":\" ABF_RX_RELATIVITY\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_Unique_ID_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_FIRST_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_AMEBA_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_Effective_Date_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_AMEBA_MODEL\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_UC_ER_COPAY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_INN_OON_DED_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_COINSURANCE_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_PCP_SPEC_COPAY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_INN_OON_OOP_MAX_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_IP_OP_COPAY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_PHARMACY_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]},{\"Name\":\" ABF_PLAN_ADMIN_ERR\",\"Value\":[[\"CPD\",\"SL Limit\",\"Concat\",1,1.5,2,2.5,3]]}],\"Message\":\"\",\"Entity\":null}";
ObjectMapper mapper = new ObjectMapper();
OutputRanges OutputRanges=null;
try {
OutputRanges = mapper.readValue(jsonString, OutputRanges.class);
} catch (JsonParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("OutputRanges :: "+OutputRanges);;
System.out.println("OutputRanges.getOutputRanges() :: "+OutputRanges.getOutputRanges());;
for (Range r : OutputRanges.getOutputRanges()) {
System.out.println(r.getName());
}
}
}
private static String readAll(Reader rd) throws IOException {
StringBuilder sb = new StringBuilder();
int cp;
while ((cp = rd.read()) != -1) {
sb.append((char) cp);
}
return sb.toString();
}
String jsonText = readAll(inputofyourjsonstream);
JSONObject json = new JSONObject(jsonText);
JSONArray arr = json.getJSONArray("Compemployes");
arr.getJSONObject(index)