为了解决另一个问题,我已从使用 Jersey 转向使用 EclipseLink MOXy 从 JAXB 创建的对象模型(由 Sun JAXB 2.1.12 创建)生成 JSON。我注意到的一个区别是输出的格式
Jersey 输出
{"artist-list":{"offset":0,"count":1,"artist":[{"score":"100","type":"Group","id":"4302e264-1cf0-4d1f-aca7-2a6f89e34b36","name":"Farming Incident","sort-name":"Incident, Farming","gender":"male","country":"AF","disambiguation":"the real one","ipi-list":{"ipi":["1001","1002"]},"life-span":{"begin":"1999-04","ended":"true"},"tag-list":{"tag":[{"count":5,"name":"thrash"},{"count":11,"name":"güth"}]}}]}}
但是 MOXy 给出了
"count" : "1",
"offset" : "0",
"artist" : [ {
"id" : "4302e264-1cf0-4d1f-aca7-2a6f89e34b36",
"type" : "Group",
"score" : "100",
"name" : "Farming Incident",
"sort-name" : "Incident, Farming",
"gender" : "male",
"country" : "AF",
"disambiguation" : "the real one",
"ipis" : [ "1001", "1002" ],
"life-span" : {
"begin" : "1999-04",
"ended" : "true"
},
"tags" : [ {
"count" : "5",
"name" : "thrash"
}, {
"count" : "11",
"name" : "güth"
} ]
} ]
}
Moxy 更漂亮:) 但是通过 Json 提供数据的原因之一是减少传输带宽,因此是否有可能让 MOXy 生成所有一行,并且每一行周围都没有额外的空格:?
最佳答案
默认EclipseLink JAXB (MOXy)将 JSON 编码到一行。要获得格式化输出,您需要在 Marshaller
上设置以下属性:
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
根
package forum11450509;
public class Root {
private String foo;
private int bar;
public String getFoo() {
return foo;
}
public void setFoo(String foo) {
this.foo = foo;
}
public int getBar() {
return bar;
}
public void setBar(int bar) {
this.bar = bar;
}
}
jaxb.properties
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
演示
以下代码演示了如何指定格式化输出:
package forum11450509;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;
public class Demo {
public static void main(String[] args) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>(2);
properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false);
JAXBContext jc = JAXBContext.newInstance(new Class[] {Root.class}, properties);
Root root = new Root();
root.setFoo("ABC");
root.setBar(123);
System.out.println("One Line:");
Marshaller marshaller = jc.createMarshaller();
marshaller.marshal(root, System.out);
System.out.println("\nFormatted:");
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(root, System.out);
}
}
输出
以下是运行演示代码的输出:
One Line
{"bar":123,"foo":"ABC"}
Formatted:
{
"bar" : 123,
"foo" : "ABC"
}
<小时/>
JAX-RS
同样的行为也适用于 MOXyJsonProvider
(请参阅:http://blog.bdoughan.com/2012/05/moxy-as-your-jax-rs-json-provider.html)。
一行
默认情况下,当您在 JAX-RS 应用程序中包含 MOXyJsonProvider
时,输出将整理在一行上:
package org.example;
import java.util.*;
import javax.ws.rs.core.Application;
import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;
public class CustomerApplication extends Application {
@Override
public Set<Class<?>> getClasses() {
HashSet<Class<?>> set = new HashSet<Class<?>>(2);
set.add(MOXyJsonProvider.class);
set.add(CustomerService.class);
return set;
}
}
格式化输出
您还可以配置 MOXyJsonProvider
来生成格式化输出:
package org.example;
import java.util.*;
import javax.ws.rs.core.Application;
import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;
public class CustomerApplication extends Application {
@Override
public Set<Class<?>> getClasses() {
HashSet<Class<?>> set = new HashSet<Class<?>>(1);
set.add(ExampleService.class);
return set;
}
@Override
public Set<Object> getSingletons() {
MOXyJsonProvider moxyJsonProvider = new MOXyJsonProvider();
moxyJsonProvider.setFormattedOutput(true);
}
}
关于java - 我如何让 MOXy 仅在一行上输出以节省空间,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11450509/