Spring Controller 編寫 示例

Spring Controller 編寫 示例

package com.eduoinfo.finances.bank.web.controller;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.core.io.ClassPathResource;
import org.springframework.http.HttpEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.Assert;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.eduoinfo.finances.bank.core.entity.JsonResult;
import com.eduoinfo.finances.bank.web.dao.TestMapper;
import com.eduoinfo.finances.bank.web.model.Test;
import com.eduoinfo.finances.bank.web.model.User;
import com.eduoinfo.finances.bank.web.service.impl.TestServiceImpl;

/**
 * Spring MVC Controller 編寫示例
 * 
 * @author StarZou
 * @since 2014年4月26日 上午11:02:20
 **/
@Controller
@RequestMapping(value = "/test")
public class TestController {

    /**
     * Service 業務層 注入
     */
    @Resource
    private TestServiceImpl testServiceImpl;

    /**
     * Dao 注入
     */
    @Resource
    private TestMapper testMapper;

    /**
     * 通過註解綁定 參數值 示例
     * 
     * @PathVariable : 從url 中 取得 參數值
     * @RequestHeader : 從請求頭中 取得 參數值
     * @RequestParam : 從請求參數中 取得 值
     * @CookieValue : 從 cookie 中取值
     */
    @RequestMapping("/**/{id}")
    @ResponseBody
    public String testValue(@PathVariable("id") String id, @RequestHeader("User-Agent") String userAgent,
            @RequestParam(value = "name", defaultValue = "null", required = false) String name, @CookieValue("JSESSIONID") String jsessionid) {
        return userAgent + "<br>" + jsessionid + "<br>" + id + "<br>" + name;
    }

    /**
     * 使用Servlet API對象作爲入參
     * 
     * @param request
     * @param response
     */
    @RequestMapping("/request")
    public void req(HttpServletRequest request, HttpServletResponse response) {
        Assert.notNull(request, "請求不能爲空");
        response.setStatus(200);
    }

    /**
     * 使用IO對象作爲入參
     * 
     * @param os
     * @throws IOException
     */
    @RequestMapping("/stream/{path}")
    public void img(OutputStream os, @PathVariable("path") String path) throws IOException {
        ClassPathResource res = new ClassPathResource("/spring-mvc.xml");
        FileCopyUtils.copy(res.getInputStream(), os);

    }

    /**
     * 表單提交 示例，bean的屬性 自動 裝配 <br>
     * 指定方法類型:method = RequestMethod.POST <br>
     * http://localhost/test/rest/test/body?name=starzou&password=123
     * 
     * @param user
     * @return
     */
    @RequestMapping(value = "/body")
    @ResponseBody
    public Object body(User user) {
        return user;
    }

    /**
     * httpEntity.getHeaders() 得到所有請求頭
     * 
     * @param httpEntity
     * @return
     */
    @RequestMapping("/http")
    @ResponseBody
    public Object http(HttpEntity<String> httpEntity) {
        return httpEntity.getHeaders().entrySet();
    }

    /**
     * 調用 業務層 方法示例
     * 
     * @return
     */
    @RequestMapping("/date")
    @ResponseBody
    public String date() {
        return testServiceImpl.date();
    }

    /**
     * Spring MVC將匹配方法參數名URI模板變量名稱
     * 
     * @param x
     * @param y
     * @return
     */
    @RequestMapping("/var/{x}/{y}")
    @ResponseBody
    public String var(@PathVariable String x, @PathVariable String y) {
        return x + "<br>" + y;
    }

    /**
     * 測試 mybaits generator生成的 dao model，進行 數據庫操作
     * 
     * @return
     */
    @RequestMapping("/tt/add")
    @ResponseBody
    public Object testAdd() {
        com.eduoinfo.finances.bank.web.model.Test test = new com.eduoinfo.finances.bank.web.model.Test();
        final long currentTimeMillis = System.currentTimeMillis();
        test.setTname("tname : " + currentTimeMillis);
        test.setTdate(new Date());
        testMapper.insert(test);
        return test;
    }

    /**
     * 數據庫 查詢
     * 
     * @return
     */
    @RequestMapping("/tt/select")
    @ResponseBody
    public Object testSelect() {
        final List<Test> list = testMapper.selectByExample(null);
        return list;
    }

    /**
     * 測試 spring mvc 返回 json , 封裝 Json 格式數據, 減少 類型轉換
     * 
     * @return
     */
    @RequestMapping("/json")
    @ResponseBody
    public JsonResult<Object[]> returnJson() {
        // 實際情況 下 String,可能是一個 自定義的Java 類,比如 User , 通常是在 數據庫查詢
        List<String> data = new ArrayList<>();
        Set<String> data2 = new HashSet<>();
        Map<String, String> data3 = new HashMap<>();

        int i = 0;
        while (i < 10) {
            String value = "data-" + (++i);
            data.add(value);
            data2.add(value);
            data3.put(value, value);
        }

        // 組裝 查詢的 結果 , 添加消息 和 是否成功的標識
        JsonResult<List<String>> jsonResult = new JsonResult<>(data, "This is a message.", true);
        JsonResult<Set<String>> jsonResult2 = new JsonResult<>(data2, "This is a message.", true);
        JsonResult<Map<String, String>> jsonResult3 = new JsonResult<>(data3, "This is a message.", true);

        // 複雜一點的 封裝
        Object[] objs = { jsonResult, jsonResult2, jsonResult3 };
        JsonResult<Object[]> jsonObj = new JsonResult<Object[]>(objs);
        return jsonObj;
    }
}