Retrofit2.0的简单使用 (包含Gson)

http://blog.csdn.net/bskfnvjtlyzmv867/article/details/70667041 (转)

参考博客：

Retrofit2使用（非常简洁易懂）

实现效果：

      

使用姿势：

   1. 使用教程

添加依赖 
compile ‘com.squareup.retrofit2:retrofit:2.2.0’
compile ‘com.squareup.retrofit2:converter-gson:2.2.0’

AndroidStudio添加Gson插件——GsonFormat

   2. 使用API

所用api：http://www.mrsorrow.xin/pro/rank_querySpecRankByUniv?university.univCode=10280&page=1
功能：根据高校代码进行学科专业类排名

返回json如下：

{
"rows": [
{
"id": 1893,
"specCode": "",
"specName": "冶金工程类",
"univCode": "10280",
"univName": "上海大学",
"univRank": "5",
"univScore": "78"
},
{
"id": 328,
"specCode": "0303",
"specName": "社会学类",
"univCode": "10280",
"univName": "上海大学",
"univRank": "8",
"univScore": "77"
},
{
"id": 828,
"specCode": "0503",
"specName": "新闻传播学类",
"univCode": "10280",
"univName": "上海大学",
"univRank": "10",
"univScore": "77"
},
{
"id": 3959,
"specCode": "1303",
"specName": "戏剧与影视学类",
"univCode": "10280",
"univName": "上海大学",
"univRank": "4",
"univScore": "77"
},
{
"id": 396,
"specCode": "0305",
"specName": "马克思主义理论类",
"univCode": "10280",
"univName": "上海大学",
"univRank": "17",
"univScore": "76"
}
]
}

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   3. 入门使用Retrofit

定义接口（封装URL地址和数据请求） ：

@GET("rank_querySpecRankByUniv")
Call<ResponseBody> querySpecRankByUniv(
@Query("university.univCode") String univCode,
@Query("page") int page);

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实例化Retrofit：

Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Constant.BASE_URL)
.build();

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通过Retrofit实例创建接口服务对象

QueryRankService service = retrofit.create(QueryRankService.class);

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ResponseBody中存放着我们请求的数据，调用response.body().string()转化为字符串：

Call<ResponseBody> call = service.querySpecRankByUniv("10280", 1);
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
if(response.isSuccessful()){
try {
String result = response.body().string();
mTextView.setText(result);
} catch (IOException e) {
e.printStackTrace();
}
}
}

@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {

}
});

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   4. 使用GsonFormat生成Bean

新建Bean类——SpecRank.java
类中右键Generate–》GsonFormat，将json样例拷贝进AS，点击ok即可

生成如下：

package com.ping.retrofit2.beans;

import java.util.List;

/**
* SpecRankBean
* Created by Mr.sorrow on 2017/4/24.
*/

public class SpecRankBean {

private List<RowsBean> rows;

public List<RowsBean> getRows() {
return rows;
}

public void setRows(List<RowsBean> rows) {
this.rows = rows;
}

public static class RowsBean {
/**
* id : 1893
* specCode :
* specName : 冶金工程类
* univCode : 10280
* univName : 上海大学
* univRank : 5
* univScore : 78
*/

private int id;
private String specCode;
private String specName;
private String univCode;
private String univName;
private String univRank;
private String univScore;

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getSpecCode() {
return specCode;
}

public void setSpecCode(String specCode) {
this.specCode = specCode;
}

public String getSpecName() {
return specName;
}

public void setSpecName(String specName) {
this.specName = specName;
}

public String getUnivCode() {
return univCode;
}

public void setUnivCode(String univCode) {
this.univCode = univCode;
}

public String getUnivName() {
return univName;
}

public void setUnivName(String univName) {
this.univName = univName;
}

public String getUnivRank() {
return univRank;
}

public void setUnivRank(String univRank) {
this.univRank = univRank;
}

public String getUnivScore() {
return univScore;
}

public void setUnivScore(String univScore) {
this.univScore = univScore;
}
}
}

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   5. 使用Gson解析

定义接口（封装URL地址和数据请求） ：

@GET("rank_querySpecRankByUniv")
Call<SpecRankBean> querySpecRankByUnivUseGson(
@Query("university.univCode") String univCode,
@Query("page") int page);

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实例化Retrofit：

Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Constant.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();

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将请求的数据可以直接转换为我们的Bean，通过各种get方法获取我们想要的数据：

call.enqueue(new Callback<SpecRankBean>() {
@Override
public void onResponse(Call<SpecRankBean> call, Response<SpecRankBean> response) {
if(response.isSuccessful()){
SpecRankBean bean = response.body();
List<SpecRankBean.RowsBean> list = bean.getRows();
String result = "";
for (SpecRankBean.RowsBean rowsBean : list) {
result += rowsBean.getUnivName() + rowsBean.getSpecName() + "\n";
}
mTextView.setText(result);
}
}

@Override
public void onFailure(Call<SpecRankBean> call, Throwable t) {

}
});

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