【原创】SpringMVC开发提速

本类扩展了Controller的返回值类型(包括html,javascript,json,页面重定向和文件下载等),还提供了url取值,对象取值等方法,还可以方法内直接用getRequest()方法取request对象,不需要通过手动注入参数列表。使用方法也是非常简单,直接继承本类就可以,不用引任何jar包和写任何配置文件。

BaseController.java
public class BaseController {

    private HttpServletRequest request;
    private HttpServletResponse response;
    private HttpSession session;
    private static ObjectMapper objectMapper = new ObjectMapper();
    private static final String PATH_WITHIN_HANDLER_MAPPING_ATTR = "org.springframework.web.servlet.HandlerMapping.pathWithinHandlerMapping";

    @ModelAttribute
    protected void setReqAndRes(HttpServletRequest request, HttpServletResponse response){
        this.request = request;
        this.response = response;;
        this.session = request.getSession();;
    }

    protected HttpServletRequest getRequest() {
        return request;
    }

    protected HttpServletResponse getResponse() {
        return response;
    }

    protected HttpSession getSession() {
        return session;
    }

    protected PrintWriter getWriter(String contentType, String contentEncoding) throws Exception {
        getResponse().setContentType(contentType + ";charset=" + contentEncoding);
        return getResponse().getWriter();
    }

    protected ServletOutputStream getOutputStream(String contentType, String fileName, String contentEncoding) throws Exception {
        getResponse().setContentType(contentType);
        getResponse().setHeader("content-disposition", "attachment; filename=" + java.net.URLEncoder.encode(fileName, contentEncoding));
        return getResponse().getOutputStream();
    }

    protected void Page(String path, String prefix, String suffix) {
        try {
            path = prefix + path + suffix;
            getRequest().getRequestDispatcher(path).forward(getRequest(), getResponse());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void Page(String path, String prefix) {
        Page(path, prefix, ".jsp");
    }

    protected void Page(String path) {
        Page(path, "/WEB-INF/view/", ".jsp");
    }

    protected void Content(String content, String contentType, String contentEncoding) {
        try {
            getWriter(contentType, contentEncoding).write(content);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void Content(String content, String contentEncoding) {
        Content(content, "text/html", contentEncoding);
    }

    protected void Content(String content) {
        Content(content, "UTF-8");
    }

    protected void JavaScript(String javaScript, String contentType, String contentEncoding) {
        try {
            getWriter(contentType, contentEncoding).write(javaScript);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void JavaScript(String javaScript, String contentEncoding) {
        JavaScript(javaScript, "text/javascript", contentEncoding);
    }

    protected void JavaScript(String javaScript) {
        JavaScript(javaScript, "UTF-8");
    }

    protected void Json(String json, String contentType, String contentEncoding) {
        try {
            getWriter(contentType, contentEncoding).write(json);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void Json(String json, String contentEncoding) {
        Json(json, "application/json", contentEncoding);
    }

    protected void Json(String json) {
        Json(json, "UTF-8");
    }

    protected void Json(Object data, String contentType, String contentEncoding) {
        try {
            Json(new ObjectMapper().writeValueAsString(data), contentType, contentEncoding);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void Json(Object data, String contentEncoding) {
        try {
            Json(new ObjectMapper().writeValueAsString(data), contentEncoding);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void Json(Object data) {
        try {
            Json(new ObjectMapper().writeValueAsString(data));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void Redirect(String url) {
        try {
            getResponse().sendRedirect(url);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    protected void FileContent(byte[] fileContents, String fileDownloadName, String contentType, String contentEncoding) {
        ServletOutputStream out2 = null;
        try {
            out2 = getOutputStream(contentType, fileDownloadName, contentEncoding);
            out2.write(fileContents);
            out2.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (out2 != null)
                try {
                    out2.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
        }
    }

    protected void FileContent(byte[] fileContents, String fileDownloadName, String contentEncoding) {
        FileContent(fileContents, fileDownloadName, "application/zip", contentEncoding);
    }

    protected void FileContent(byte[] fileContents, String fileDownloadName) {
        FileContent(fileContents, fileDownloadName, "UTF-8");
    }

    protected void FileStream(InputStream fileStream, String fileDownloadName, String contentType, String contentEncoding) {
        int status = 0;
        byte[] b = new byte[1024];
        InputStream in = null;
        ServletOutputStream out2 = null;
        try {
            in = fileStream;
            out2 = getOutputStream(contentType, fileDownloadName, contentEncoding);
            while (status != -1) {
                status = in.read(b);
                out2.write(b);
            }
            out2.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null)
                try {
                    in.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            if (out2 != null)
                try {
                    out2.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
        }
    }

    protected void FileStream(InputStream fileStream, String fileDownloadName, String contentEncoding) {
        FileStream(fileStream, fileDownloadName, "application/zip", contentEncoding);
    }

    protected void FileStream(InputStream fileStream, String fileDownloadName) {
        FileStream(fileStream, fileDownloadName, "UTF-8");
    }

    protected void FilePath(String filePath, String fileDownloadName, String contentType, String contentEncoding) {
        int status = 0;
        byte[] b = new byte[1024];
        FileInputStream in = null;
        ServletOutputStream out2 = null;
        String fileName;
        if (org.springframework.util.StringUtils.isEmpty(fileDownloadName)) {
            File tempFile = new File(filePath);
            fileName = tempFile.getName();
        } else {
            fileName = fileDownloadName;
        }
        try {
            in = new FileInputStream(filePath);
            out2 = getOutputStream(contentType, fileName, contentEncoding);
            while (status != -1) {
                status = in.read(b);
                out2.write(b);
            }
            out2.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null)
                try {
                    in.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            if (out2 != null)
                try {
                    out2.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
        }
    }

    protected void FilePath(String filePath, String fileDownloadName, String contentEncoding) {
        FilePath(filePath, fileDownloadName, "application/zip", contentEncoding);
    }

    protected void FilePath(String filePath, String fileDownloadName) {
        FilePath(filePath, fileDownloadName, "UTF-8");
    }

    protected void FilePath(String filePath) {
        FilePath(filePath, null);
    }

    protected <T> T getModel(Class<T> modelClass, String modelName) {
        ObjectNode objectNode = objectMapper.createObjectNode();
        String modelNameAndDot = !org.springframework.util.StringUtils.isEmpty(modelName) ? modelName + "." : null;
        Map<String, String[]> requestMap = getRequest().getParameterMap();
        for (Map.Entry<String, String[]> entry : requestMap.entrySet()) {
            String paraName = entry.getKey();
            String attrName;
            if (modelNameAndDot != null) {
                if (paraName.startsWith(modelNameAndDot)) {
                    attrName = paraName.substring(modelNameAndDot.length());
                } else {
                    continue;
                }
            } else {
                if (!paraName.contains(".")) {
                    attrName = paraName;
                } else {
                    continue;
                }
            }
            String[] paraValueArray = entry.getValue();
            String paraValue = (paraValueArray != null && paraValueArray.length > 0) ? paraValueArray[0] : null;
            objectNode.put(attrName, paraValue);
        }
        try {
            return objectMapper.treeToValue(objectNode, modelClass);
        }catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    protected <T> T getModel(Class<T> modelClass) {
        return getModel(modelClass, null);
    }

    protected String getPara(int index) {
        String pathWithinHandlerMapping = getRequest().getAttribute(PATH_WITHIN_HANDLER_MAPPING_ATTR).toString();
        String[] paraArr = split(pathWithinHandlerMapping, '/');

        if (paraArr.length > index) {
            return paraArr[index];
        }
        return "";
    }

    protected String getPara(String paraName) {
        return getRequest().getParameter(paraName);
    }

    protected void setObject(String objectName, Object object) {
        getRequest().setAttribute(objectName, object);
    }

    protected Object getObject(String objectName) {
        return getRequest().getAttribute(objectName);
    }

    private static String[] split(final String str, final char separatorChar) {
        return splitWorker(str, separatorChar, false);
    }

    private static String[] splitWorker(final String str, final char separatorChar, final boolean preserveAllTokens) {
        // Performance tuned for 2.0 (JDK1.4)

        if (str == null) {
            return null;
        }
        final int len = str.length();
        if (len == 0) {
            return new String[0];
        }
        final List<String> list = new ArrayList<String>();
        int i = 0, start = 0;
        boolean match = false;
        boolean lastMatch = false;
        while (i < len) {
            if (str.charAt(i) == separatorChar) {
                if (match || preserveAllTokens) {
                    list.add(str.substring(start, i));
                    match = false;
                    lastMatch = true;
                }
                start = ++i;
                continue;
            }
            lastMatch = false;
            match = true;
            i++;
        }
        if (match || preserveAllTokens && lastMatch) {
            list.add(str.substring(start, i));
        }
        return list.toArray(new String[list.size()]);
    }
}
TestController.java
@Controller
public class TestController extends BaseController {

    /*测试html*/
    @RequestMapping("/testContent")
    public void testContent() {
        Content("<font color='red'>testContent</font>");
    }

    /*测试javascript*/
    @RequestMapping("/testJavascript")
    public void testJavascript() {
        JavaScript("alert('testJavascript');");
    }

    /*测试json*/
    @RequestMapping("/testJson")
    public void testJson() {
        User user = new User();
        user.setUserName("testJson");
        Json(user);
    }

    /*测试重定向*/
    @RequestMapping("/testRedirect")
    public void testRedirect() {
        Redirect("http://www.baidu-x.com/?q=%E5%9B%A0%E9%85%B7%E6%95%99%E8%82%B2");
    }

    /*测试url传值*/
    /*http://127.0.0.1/testGetPara/hello/world?test=2333*/
    @RequestMapping("/testGetPara/{111}/{222}")
    public void testGetPara2() {
//      String para1 = getPara(0); // para1对应的是testGetPara2
        String para2 = getPara(1);
        String para3 = getPara(2);
//      System.out.println("==>>> " + para1);
        System.out.println("==>>> " + para2);
        System.out.println("==>>> " + para3);

        String para = getPara("test");
        System.out.println("==>>> " + para);
    }

    /*测试对象传值*/
    /*http://127.0.0.1/testGetModel?userName=hello&user2.userName=world*/
    @RequestMapping("/testGetModel")
    public void testGetModel() {
        User user1 = getModel(User.class);
        User user2 = getModel(User.class, "user2");
        System.out.println("==>>> " + user1.getUserName());
        System.out.println("==>>> " + user2.getUserName());
    }

    /*测试文件下载(文件名)*/
    @RequestMapping("/testFilePath")
    public void testFilePath() {
        String filePath = "F:\\idea\\inxedu\\demo_inxedu_open\\src\\main\\webapp\\350ClientV5.3.exe";
        FilePath(filePath);
    }

    /*测试文件下载(流)*/
    @RequestMapping("/testFileStream")
    public void testFileStream() throws Exception {
        String filePath = "F:\\idea\\inxedu\\demo_inxedu_open\\src\\main\\webapp\\350ClientV5.3.exe";
        FileInputStream fileInputStream = new FileInputStream(filePath);
        FileStream(fileInputStream, "350ClientV5.3.exe");
    }

    /*测试文件下载(字节)*/
    @RequestMapping("/testFileContent")
    public void testFileContent() throws Exception {
        String filePath = "F:\\idea\\inxedu\\demo_inxedu_open\\src\\main\\webapp\\350ClientV5.3.exe";
        File file = new File(filePath);
        long len = file.length();
        byte[] bytes = new byte[(int) len];
        FileInputStream fileInputStream = new FileInputStream(file);
        BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
        int r = bufferedInputStream.read(bytes);
        bufferedInputStream.close();
        FileContent(bytes, "350ClientV5.3.exe");
    }
}
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