安卓前端连接springboot后端

本文仅记录安卓如何通过get请求获取springboot后端传来的json数据并解析，对springboot后端如何编写暂无涉及

1. 准备好工具类HTTPUtils,此工具类用于连接后端的所要求的path路径，只需填入url路径即可，会返回后端传来的String字符串数据

   请先在AndroidManifest.xml文件中添加网络允许设置<uses-permission android:name="android.permission.INTERNET" />

   public class HttpUtils {
   /**
   * @Description: 封装好的http网络连接工具类
   * @Param: [urlStr] 为springboot所要求访问的RequestMapping网址
   * @return: java.lang.String
   * @Author: YAO
   * @Date: 2022/3/6
   */
   public static String gethttpresult(String urlStr) {
   try {
   URL url = new URL(urlStr);//获取url对象
   HttpURLConnection connect = (HttpURLConnection) url.openConnection();//url对象进行http连接
   InputStream input = connect.getInputStream();
   BufferedReader in = new BufferedReader(new InputStreamReader(input));
   String line = null;
   System.out.println(connect.getResponseCode());
   StringBuffer sb = new StringBuffer();
   while ((line = in.readLine()) != null) {
   sb.append(line);//逐行读取传来的String
   }
   return sb.toString();
   } catch (Exception e) {
   System.out.println(e.toString());
   return null;
   }
   }
   }
   

2. 将传来的数据转化为JSON，并通过解析JSON来实现相当于读取数据库数据的目的

   String result = httpUtil.gethttpresult(url);//利用工具类获取网络连接
   JSONArray post_all = new JSONArray(result);//将返回的数据转换为JSON串格式
   //
   JSONArray post_all = result_json.getJSONArray("post_all");
   for (int i = 0; i < post_all.length(); i++) {
   post post_data = new post();//实例化post对象，用于存装从JSON解析出来的数据
   JSONObject object = post_all.getJSONObject(i);
   post_data.post_id = Integer.parseInt(object.getString("post_id"));
   post_data.post_context = object.getString("post_context");
   post_data.post_star = Integer.parseInt(object.getString("post_star"));
   post_data.post_replay = Integer.parseInt(object.getString("post_replay"));
   post_list.add(post_data);//将一个个装好JSON数据的对象加入到对象list中
   }
   

3. 应用举例

   springboot的Controller层接口

@Controller
@RequestMapping("/post")
@ResponseBody
public class showPostController {
@Autowired
GetPostServiceImpl getPostService;
@RequestMapping("/post_main")
@ResponseBody
public List<post> getAllPost(HttpSession session, ModelMap map) {
List<post> post_all = new ArrayList<>();
post post_data;
int post_count = getPostService.getPostCount();
for (int i = 1; i <= post_count; i++) {
post_data = getPostService.getPost(i);
post_all.add(post_data);
}
System.out.println(post_all);
map.addAttribute("post_all", post_all);
return post_all;
}

可见路径为http://localhost:8080/post/post_main，返回的是从数据库中提取的List对象数组，其中post为自己设置的实例化对象，对应数据库中的一张表。

Activity的应用代码

public class HoleActivity extends AppCompatActivity {
HoleAdapter mMyAdapter;
RecyclerView mRecyclerView;
List<post> post_list = new ArrayList<>();
HttpUtils httpUtil;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hole);
String url = "http://yourip:8080/post/post_main";//此处改为自己的路径
/**
* @Description: 进入到RecyclerView页面后，向后端申请全部post数据
* @Param: [savedInstanceState]
* @return: void
* @Author: YAO
* @Date: 2022/3/6
*/
new Thread() {
@Override
public void run() {
String result = httpUtil.gethttpresult(url);//利用工具类获取网络连接
System.out.println(result);
if (result == null) {
Looper.prepare();
Toast.makeText(HoleActivity.this, "网络连接错误！", Toast.LENGTH_SHORT).show();
Looper.loop();
} else {
try {
JSONArray post_all = new JSONArray(result);//将返回的数据转换为JSON串格式
//
JSONArray post_all = result_json.getJSONArray("post_all");
for (int i = 0; i < post_all.length(); i++) {
post post_data = new post();//实例化post对象，用于存装从JSON解析出来的数据
JSONObject object = post_all.getJSONObject(i);
post_data.post_id = Integer.parseInt(object.getString("post_id"));
post_data.post_context = object.getString("post_context");
post_data.post_star = Integer.parseInt(object.getString("post_star"));
post_data.post_replay = Integer.parseInt(object.getString("post_replay"));
post_list.add(post_data);//将一个个装好JSON数据的对象加入到对象list中
}
} catch (JSONException e) {
e.printStackTrace();
System.out.println(e.toString());
Looper.prepare();
Toast.makeText(HoleActivity.this, "文件解析错误！", Toast.LENGTH_SHORT).show();
Looper.loop();
}
}
}
}.start();
//获取RecyclerView对象
mRecyclerView = findViewById(R.id.hole_rv);
//设置adapter
mMyAdapter = new HoleAdapter(HoleActivity.this, post_list);
mRecyclerView.setAdapter(mMyAdapter);
//设置layoutManager
LinearLayoutManager layoutManager = new LinearLayoutManager(HoleActivity.this);
mRecyclerView.setLayoutManager(layoutManager);
//设置Decoration分割线
DividerItemDecoration decoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
decoration.setDrawable(getResources().getDrawable(R.drawable.divider, null));
mRecyclerView.addItemDecoration(decoration);
}
}

项目源码链接：https://github.com/YaoTengqi/GreenLife

END

最后

以上就是高大宝马为你收集整理的安卓前端连接springboot后端安卓前端连接springboot后端的全部内容，希望文章能够帮你解决安卓前端连接springboot后端安卓前端连接springboot后端所遇到的程序开发问题。

如果觉得靠谱客网站的内容还不错，欢迎将靠谱客网站推荐给程序员好友。