zuoli zhu zuoli zhu - 9 months ago 101
Java Question

How to use Jackson to deserialize a JSON Array into java objects

I have a JSON array

{ "inList" :
[
{ "cmd" : "enqueue", "name" : "job1", "pri" : 4 },
{ "cmd" : "enqueue", "name" : "job2", "pri" : 3 },
{ "cmd" : "dequeue" },
{ "cmd" : "enqueue", "name" : "job3", "pri" : 0 },
{ "cmd" : "enqueue", "name" : "job4", "pri" : 1 },
{ "cmd" : "dequeue" }
]
}


I would like to use the powerful jackson to de serialize the JSON into java object.

And I have the hit class (I think it has something wrong)

public class InList {
private String[] inList;
private LinkedList<Object> jobs;

public InList() { }

public String[] getInList() {
return inList;
}

public void setInList(String[] inList) {
this.inList = inList;
}

public LinkedList<Object> getJobs() {
return jobs;
}

public void setJobs(LinkedList<Object> jobs) {
this.jobs = jobs;
}
}


And when I try to de serialize the JSON, it just can not hit the class

ObjectMapper mapper = new ObjectMapper();

InList inList = null;
try {
inList = mapper.readValue(jsonStr, InList.class);
}


Could you help me figure out?

Thanks!

Answer Source

Your bean class should be like below:-

 import java.util.List;
 import org.codehaus.jackson.annotate.JsonProperty;
 public class InList {  
@JsonProperty("inList")
private List<InListDetail> inList;
public List<InListDetail> getInList() {
    return inList;
}
public void setInList(List<InListDetail> inList) {
    this.inList = inList;
}
}

import org.codehaus.jackson.annotate.JsonProperty;
public class InListDetail { 
@JsonProperty("cmd")
private String cmd;
@JsonProperty("name")
private String name;
@JsonProperty("pri")
private int pri;
public String getCmd() {        
       return cmd;
}
public void setCmd(String cmd) {
    this.cmd = cmd;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}

public int getPri() {
    return pri;
}

public void setPri(int pri) {
    this.pri = pri;
}

}
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