如何使用Java处理JSON
我将JSON字符串(inputJson)传递给服务器端的java代码(PPProgramAddView)如何使用Java处理JSON,java,json,jackson,jackson-databind,Java,Json,Jackson,Jackson Databind,我将JSON字符串(inputJson)传递给服务器端的java代码(PPProgramAddView) PPProgramAddView: inputJson: [{"ppl_row":0,"ppl_time":"07:00","ppat_id":"Mw==","ppa_id":"MTI=","ppl_LeadAssist":"
PPProgramAddView:
inputJson: [{"ppl_row":0,"ppl_time":"07:00","ppat_id":"Mw==","ppa_id":"MTI=","ppl_LeadAssist":"Lead"},{"ppl_row":1,"ppl_time":"07:10","ppat_id":"Mg==","ppa_id":"NA==","ppl_LeadAssist":"Assist"}]
当我试图处理它时,我得到以下错误:
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "ppl_row" (class client.Profile14), not marked as ignorable (5 known properties: "plTime", "plActivity", "plActivityType", "plRow", "plLeadAssist"])
at [Source: (String)"[{"ppl_row":0,"ppl_time":"07:00","ppat_id":"Mw==","ppa_id":"MTI=","ppl_LeadAssist":"Lead"},{"ppl_row":1,"ppl_time":"07:10","ppat_id":"Mg==","ppa_id":"NA==","ppl_LeadAssist":"Assist"}]"; line: 1, column: 14] (through reference chain: java.lang.Object[][0]->client.Profile14["ppl_row"])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61)
我已经搜索过了,但在任何地方都找不到“plTime”、“plActivity”、“plActivityType”、“plRow”、“plLeadAssist”
我的代码是:
//Look through the new program lines and add them.
try {
ObjectMapper mapper = new ObjectMapper();
Profile14[] profiles14 = mapper.readValue(inputJson, Profile14[].class);
for (final Profile14 programLine : profiles14) {
String ppl_row = programLine.getplRow();
String ppl_time = null;
if (programLine.getplTime().length() < 1){
ppl_time = "00:01";
}else{
ppl_time = programLine.getplTime();
}
String ppat_id_encoded = programLine.getplActivityType();
String ppa_id_encoded = programLine.getplActivity();
String ppl_LeadAssist = programLine.getplLeadAssist().substring(0, Math.min(programLine.getplLeadAssist().length(), 45));
byte[] valueDecoded3 = Base64.decodeBase64(ppat_id_encoded);//decoding part
String ppat_id = new String(valueDecoded3);
byte[] valueDecoded4 = Base64.decodeBase64(ppa_id_encoded);//decoding part
String ppa_id = new String(valueDecoded4);
System.out.println("ppID: " + ppID + " ppat_id: " + ppat_id + " ppa_id: " + ppa_id +
" ppl_row : " + ppl_row + " ppl_time: " + ppl_time + " ppl_LeadAssist: " + ppl_LeadAssist);
MySQLConnection.addPPProgramLine(ppID, ppat_id, ppa_id, ppl_row, ppl_time, ppl_LeadAssist);
}
} catch (Exception e) {
e.printStackTrace();
response.sendError(HttpServletResponse.SC_BAD_REQUEST, "Error.");
}
}
}
class Profile14 {
private String ppl_row;
private String ppl_time;
private String ppat_id;
private String ppa_id;
private String ppl_LeadAssist;
public String getplRow() {
return ppl_row;
}
public void setplRow(String ppl_row) {
this.ppl_row = ppl_row;
}
public String getplTime() {
return ppl_time;
}
public void setplTime(String ppl_time) {
this.ppl_time = ppl_time;
}
public String getplActivityType() {
return ppat_id;
}
public void setplActivityType (String ppat_id) {
this.ppat_id = ppat_id;
}
public String getplActivity() {
return ppa_id;
}
public void setplActivity(String ppa_id) {
this.ppa_id = ppa_id;
}
public String getplLeadAssist() {
return ppl_LeadAssist;
}
public void setplLeadAssist(String ppl_LeadAssist) {
this.ppl_LeadAssist = ppl_LeadAssist;
}
@Override
public String toString() {
return "Profile14 [ppl_row=" + ppl_row + ", ppl_time=" + ppl_time + ", ppat_id=" + ppat_id
+ ", ppa_id=" + ppa_id + ", ppl_LeadAssist=" + ppl_LeadAssist + "]";
}
}
//查看新的程序行并添加它们。
试一试{
ObjectMapper mapper=新的ObjectMapper();
Profile14[]profiles14=mapper.readValue(inputJson,Profile14[].class);
用于(最终概要14程序行:概要14){
字符串ppl_row=programLine.getplRow();
字符串ppl_time=null;
if(programLine.getplTime().length()<1){
ppl_time=“00:01”;
}否则{
ppl_time=programLine.getplTime();
}
字符串ppat_id_encoded=programLine.getplActivityType();
字符串ppa_id_encoded=programLine.getplActivity();
字符串ppl_LeadAssist=programLine.getplLeadAssist().substring(0,Math.min(programLine.getplLeadAssist().length(),45));
字节[]valueDecoded3=Base64.decodeBase64(ppat_id_编码);//解码部分
字符串ppat_id=新字符串(valueDecoded3);
字节[]valueDecoded4=Base64.decodeBase64(ppa_id_编码);//解码部分
字符串ppa_id=新字符串(值解码4);
System.out.println(“ppID:+ppID+”ppat_id:+ppat_id+”ppa_id:+ppa_id+
“ppl_行:“+ppl_行+”ppl_时间:“+ppl_时间+”ppl_引导辅助:“+ppl_引导辅助”);
MySQLConnection.addPPProgramLine(ppID、ppat_id、ppa_id、ppl_行、ppl_时间、ppl_LeadAssist);
}
}捕获(例外e){
e、 printStackTrace();
senderro(HttpServletResponse.SC_BAD_请求,“Error”);
}
}
}
班级简介14{
私有字符串ppl_行;
私有字符串ppl_时间;
私有字符串ppat_id;
私有字符串ppa_id;
私人字符串ppl_LeadAssist;
公共字符串getplRow(){
返回ppl_行;
}
公共无效设置行(字符串ppl_行){
this.ppl_行=ppl_行;
}
公共字符串getplTime(){
返回ppl_时间;
}
公共无效设置时间(字符串ppl_时间){
this.ppl_time=ppl_time;
}
公共字符串getplActivityType(){
返回ppat_id;
}
public void setplActivityType(字符串ppat_id){
this.ppat_id=ppat_id;
}
公共字符串getplActivity(){
返回ppa_id;
}
公共无效设置活动(字符串ppa_id){
this.ppa_id=ppa_id;
}
公共字符串getplLeadAssist(){
返回ppl_LeadAssist;
}
公共无效设置引导辅助(字符串ppl\U引导辅助){
this.ppl_LeadAssist=ppl_LeadAssist;
}
@凌驾
公共字符串toString(){
返回“Profile14[ppl_row=“+ppl_row+”,ppl_time=“+ppl_time+”,ppat_id=“+ppat_id
+“,ppa_id=“+ppa_id+”,ppl_LeadAssist=“+ppl_LeadAssist+”]”;
}
}
您没有遵循JavaBean标准,没有明确的说明,Jackson不知道如何映射您的类
Java惯例是命名属性,如pplRow
,而JSON使用的是另一种Ruby风格的ppl\u行
。有三种选择:
- 切换整个Jackson引擎以使用备用样式。(这不是个好主意,因为它容易引起碰撞
- 告诉Jackson为特定Java类使用另一种样式(我们将这样做)
- 用
注释每个属性(虽然有效,但需要付出很多额外的努力)@JsonProperty
class Profile14 {
private String pplRow;
public String getPplRow() {
return this.pplRow;
}
public void setPplRow(String s) {
this.pplRow = s;
}
}
请注意,方法的命名定义了属性(因为支持字段是私有的,技术上不必存在)。您现有的属性与名称不匹配(pl
,而不是ppl
),并且没有正确的大小写
现在将此注释添加到类中:
@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)
这告诉Jackson使用snake\u case
命名所有属性。这应该足以让映射正常工作