5.Core Json – JSON和Java
最后更新于：2022-04-01 05:30:55
Jackson (http://jackson.codehaus.org/) 库是一个流行的以[Java](http://w3cschool.codecloud.net/java/java-hello-world.html)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。