Jackson (http://jackson.codehaus.org/) 库是一个流行的以Java为基础的JSON API。这里有一个如何编译一个地址对象为JSON对象，或者如何将JSON对象解析为地址对象的例子。

import java.io.Writer;
import java.io.StringWriter;
import org.codehaus.jackson.map.ObjectMapper;

public class Address {
private String line1;

private String city;
private String stateOrProvince;
private String zipOrPostalCode;
private String country;

public Address() {}

public String getLine1() {
return line1;
}

public void setLine1(line1) {

   this.line1 = line1;

}
// Remaining getters and setters ...
}
Address addrOut = new Address();

// Call setters to populate addrOut …

ObjectMapper mapper = new ObjectMapper(); 
// Reuse this.

// Marshal Address object to JSON String.
Writer writer = new StringWriter();
mapper.writeValue(writer, addrOut);
System.out.println(writer.toString());

// Unmarshal Address object from JSON String.

String addrJsonStr = 
"{" +
""address" : {" +
""line1" : "555 Main Street"," +
""city" : "Denver","
""stateOrProvince" : "CO","
""zipOrPostalCode" : "80202"," +
""country" : "USA"" +
"}" +
"}";

Address addrIn = mapper.readValue(addrJsonStr, Address.class);

除了Jackson外，也包含其他著名的以java为基础的JSON APIs。