Eclipse gave option to auto generate the toString method for every class.
Further leverage this facility, I am creating String Format Template to give as Json format when eclipse generate toString Method.
I used following String Format Template:
{ ${member.name()}:"${member.value}", ${otherMembers}}
now i generated toString method as following POJO but When i run this program i got result as and not a VALID JSON.
{ name:"null", reportees:"[1, 2, 3]", department:"[retail, banking, finance]", owns:"null", supplimentary:"null}
Code
public class TestPojo {
private String name;
private List<String> reportees;
private String[] department;
private Machine owns;
private List<Machine> supplimentary;
public static void main(String arg[]) {
TestPojo aTestPojo = new TestPojo();
aTestPojo.department = new String[] { "retail", "banking", "finance" };
aTestPojo.reportees = new ArrayList<String>() {
{
add("1");
add("2");
add("3");
}
};
System.out.print(aTestPojo);
}
public static class Machine {
private String machineName;
private String duties;
public String getMachineName() {
return machineName;
}
public void setMachineName(String machineName) {
this.machineName = machineName;
}
public String getDuties() {
return duties;
}
public void setDuties(String duties) {
this.duties = duties;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("{ machineName:"").append(machineName).append("", duties:"").append(duties).append("}");
return builder.toString();
}
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("{ name:"").append(name).append("", reportees:"").append(reportees).append("", department:"").append(Arrays.toString(department)).append("", owns:"").append(owns).append("", supplimentary:"").append(supplimentary).append("}");
return builder.toString();
}
}
Answer
With the help of @dvlcube idea. I built a “Eclipse Custom toString() builder” to generate toString method code to return a JSON formatted string of current object.
Follow the github for this solution Click [Eclipse toString_Builder for JSON](https://github.com/djaganathan/EclipseToStringBuilderForJson/blob/master/src/main/java/com/github/djaganathan/opensource/eclipse/util/JsonToStringBuilder.java,”Custom Eclipse toString() Builder”)
Sample Testing Code
import com.google.common.collect.Maps;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.time.StopWatch;
import org.elasticsearch.common.collect.Lists;
public class TestPojo {
private String name;
private List<String> reportees;
private String[] department;
private Machine owns;
private List<Machine> supplimentary;
private int i = 10;
private Map<String, Machine> machineList = Maps.newConcurrentMap();
public static void main(String arg[]) {
TestPojo aTestPojo = new TestPojo();
aTestPojo.department = new String[] { "retail", "banking", "finance"};
aTestPojo.reportees = new ArrayList<String>() {
{
add("1");
add("2");
add("3");
}
};
Machine aMachine = new Machine("Train", "travel");
Machine aMachine1 = new Machine("Lorry", "Carrier");
aTestPojo.supplimentary = Lists.newArrayList(aMachine, aMachine1);
aTestPojo.machineList.put("Train", aMachine);
aTestPojo.machineList.put("Lorry", aMachine1);
System.out.print(aTestPojo);
}
public static class Machine {
private String machineName;
private String duties;
public Machine(String machineName, String duties) {
super();
this.machineName = machineName;
this.duties = duties;
}
public String getMachineName() {
return machineName;
}
public void setMachineName(String machineName) {
this.machineName = machineName;
}
public String getDuties() {
return duties;
}
public void setDuties(String duties) {
this.duties = duties;
}
@Override
public String toString() {
JsonToStringBuilder builder = new JsonToStringBuilder(this);
builder.append("machineName", machineName);
builder.append("duties", duties);
return builder.build();
}
}
@Override
public String toString() {
JsonToStringBuilder builder = new JsonToStringBuilder(this);
builder.append("name", name);
builder.append("reportees", reportees);
builder.append("department", department);
builder.append("owns", owns);
builder.append("supplimentary", supplimentary);
builder.append("i", i);
builder.append("machineList", machineList);
String value = builder.build();
return value;
}
}
While running this program i got the following JSON output
{"name": null,"reportees": ["1","2","3"],"department": ["retail","banking","finance"],"owns": null,"supplimentary": [{"machineName": "Train","duties": "travel"},{"machineName": "Lorry","duties": "Carrier"}],"i": 10,"machineList": {"Lorry": {"machineName": "Lorry","duties": "Carrier"},"Train": {"machineName": "Train","duties": "travel"}}}
