杂项

1.@media在IE8不兼容，使用bootstrap的栅格布局，布局都错乱，引入respond.js文件立竿见影。

2.webSocket在IE10有时候会失效.

判断版本：

if(navigator.appName == "Microsoft Internet Explorer"&&navigator.appVersion.match(/10./i)=='10.'){
        window.setInterval(loopGetToast, 3000);
}

3.音乐播放

<audio id='music' src=""></audio>
<script>
    // 检查是否正在播放
    var isPlaying = false;
    function play() {
        var player = document.querySelector('#music');
        if (isPlaying) {
            // 如果正在播放, 停止播放并停止读取此音乐文件
            player.pause();
            player.src = '';
        } else {
            player.src = '${path}/static/88150832580.mp3';
            player.play();
        }
    }
</script>

4.   var title = $("#title").val().replace(/^s*|s*$/g, ""); //标题 replace方法用来替换trim()方法，trim方法不兼容IE8

5. 静态方法中使用非静态变量

/**
 * 静态方法中使用非静态变量
 */
@Component
public class AsyncTask {

    @Autowired
    protected RedisTemplate redisTemplate;

    protected static AsyncTask asyncTask;

    @PostConstruct
    public void init() {
        asyncTask = this;
        asyncTask.redisTemplate = this.redisTemplate;
    }
    private static synchronized void send(){
        RedisTemplate redisTemplate = asyncTask.redisTemplate;
    
    }
}

6.springBoot中在方法或者类上加@Async注解，表示是异步类或者方法

7.list去重  new ArrayList(new HashSet(list));

8.线程池正取姿势：

#线程池基本线程数
corePoolSize=10
#线程池最大线程数
maximumPoolSize=100
#线程没有任务后多久回收内存（毫秒）
keepAliveTime=2000
#线程缓冲容量
capacity=200

ThreadPoolExecutor executor = new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, TimeUnit.MILLISECONDS,
        new LinkedBlockingQueue<Runnable>(capacity));

9.post请求：

String post_result = CallingInterface.post(jb, login_url + "getUsers");
        JSONObject object = (JSONObject) JSONArray.parse(post_result);

        JSONObject dataJson = object.getJSONObject("data");
        JSONArray userList = dataJson.getJSONArray("userList");

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public class CallingInterface {
    public static String post(JSONObject json,String URL) {

        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(URL);

        post.setHeader("Content-Type", "application/json");
        post.addHeader("Authorization", "Basic YWRtaW46");
        String result = "";

        try {

            StringEntity s = new StringEntity(JSONObject.toJSONString(json), "utf-8");
            s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
            post.setEntity(s);

            // 发送请求
            HttpResponse httpResponse = client.execute(post);

            // 获取响应输入流
            InputStream inStream = httpResponse.getEntity().getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    inStream, "utf-8"));
            StringBuilder strber = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null)
                strber.append(line + "
");
            inStream.close();

            result = strber.toString();
            System.out.println(result);

            if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

                System.out.println("请求服务器成功，做相应处理");

            } else {

                System.out.println("请求服务端失败");

            }


        } catch (Exception e) {
            System.out.println("请求异常");
            throw new RuntimeException(e);
        }

        return result;
    }
}

10.消息通知轮询，在redis中存放、取出消息

list右侧插入消息： 

ListOperations lo = redisTemplate.opsForList();
            lo.rightPush(Constants.RedisListForLowVersionIE + user_id, str + address);
list左侧弹出消费：

 //获取list操作类
            ListOperations lo = redisTemplate.opsForList();
            //循环获取redis中list的第一个值,并进行拼接,如果为null证明没有,设置b为false退出循环
            String s = (String) lo.leftPop(Constants.RedisListForLowVersionIE + user_id);

11.接口获取入参：

string = securityOutService.analyzeRequestParameter(request);
JSONObject data = JSONObject.parseObject(string, JSONObject.class);
token = data.getString("token");//用于根据用户id获取用户详细信息

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundValueOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

@Service
@Transactional(readOnly = true)
public class SecurityOutService implements InitializingBean {


    @Autowired
    private RedisTemplate redisTemplate;



    public String getTokenByRedis(String key){

        BoundValueOperations<String, String> boundValueOps = redisTemplate.boundValueOps(key);
        return boundValueOps.get();

    }

    /**
     * 获取post请求中的参数
     * @param request
     * @return
     * @
     */
    public  String analyzeRequestParameter(HttpServletRequest request)  throws IOException{

        String string ="";
        //String data=request.getParameter("data");
        String data=null;

        if(StringUtils.isNotBlank(data)){

            string=data;

        }else{
            InputStream inputStream = request.getInputStream();

            ByteArrayOutputStream reqDataByteArrayOutputStream = new ByteArrayOutputStream();
            // 1、请求数据的获取
            int length = request.getContentLength();
            System.out.println("length:"+length);
            if (length == 0) {
                throw new RuntimeException();
            }

            byte[] b = new byte[1024];
            int tempLength = -1;
            while ((tempLength = inputStream.read(b)) != -1) {
                reqDataByteArrayOutputStream.write(b, 0, tempLength);
            }
            if (reqDataByteArrayOutputStream.size() != request.getContentLength()) {// 读取失败
//                throw new RuntimeException();
            }
            string = reqDataByteArrayOutputStream.toString();
        }

        System.err.println("string:
"+string);

        return string;

    }

    public  void responseJsonResult(HttpServletResponse response, Object o)  {

        try {

            if(o!=null){
                response.getWriter().write(JsonMapper.toJsonString(o));
            }else{
                response.getWriter().write("");
            }

        }catch (IOException e){
            e.printStackTrace();
        }

    }

    public  void responseJsonResult(HttpServletResponse response, List o)  {

        try {

            if(o!=null){
                response.getWriter().write(JsonMapper.toJsonString(o));
            }else{
                response.getWriter().write("");
            }

        }catch (IOException e){
            e.printStackTrace();
        }

    }
    public  void responseJsonResult(HttpServletResponse response, Map o)  {
        try {

            if(o!=null){
                response.getWriter().write(JsonMapper.toJsonString(o));
            }else{
                response.getWriter().write("");
            }

        }catch (IOException e){
            e.printStackTrace();
        }
    }

    public  void responseStringResult(HttpServletResponse response, String result)  {

        try {

            response.getWriter().write(StringUtils.isNotBlank(result)?result:"");

        }catch (IOException e){
            e.printStackTrace();
        }

    }



    @Override
    public void afterPropertiesSet() throws Exception {

    }
}

12.返回对象

        ReturnObjMap returnObj = new ReturnObjMap();
        returnObj.setRespCode(Constant.okCode);
        returnObj.setMessage(Constant.okMessage);
        returnObj.setTimeStamp(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
        securityOutService.responseJsonResult(response, returnObj);

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;

public class ReturnObjMap {
    
    private int respCode=-1;
    private String message="";
    private String timeStamp="";
    private Map<String,Serializable> data=new HashMap<String, Serializable>();
    

    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public String getTimeStamp() {
        return timeStamp;
    }
    public void setTimeStamp(String timeStamp) {
        this.timeStamp = timeStamp;
    }



    public int getRespCode() {
        return respCode;
    }

    public void setRespCode(int respCode) {
        this.respCode = respCode;
    }

    public Map<String, Serializable> getData() {
        return data;
    }

    public void setData(Map<String, Serializable> data) {
        this.data = data;
    }
}

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundValueOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;

@Service
@Transactional(readOnly = true)
public class SecurityOutService implements InitializingBean {


    @Autowired
    private RedisTemplate redisTemplate;



    public String getTokenByRedis(String key){

        BoundValueOperations<String, String> boundValueOps = redisTemplate.boundValueOps(key);
        return boundValueOps.get();

    }

    /**
     * 获取post请求中的参数
     * @param request
     * @return
     * @
     */
    public  String analyzeRequestParameter(HttpServletRequest request)  throws IOException{

        String string ="";
        //String data=request.getParameter("data");
        String data=null;

        if(StringUtils.isNotBlank(data)){

            string=data;

        }else{
            InputStream inputStream = request.getInputStream();

            ByteArrayOutputStream reqDataByteArrayOutputStream = new ByteArrayOutputStream();
            // 1、请求数据的获取
            int length = request.getContentLength();
            System.out.println("length:"+length);
            if (length == 0) {
                throw new RuntimeException();
            }

            byte[] b = new byte[1024];
            int tempLength = -1;
            while ((tempLength = inputStream.read(b)) != -1) {
                reqDataByteArrayOutputStream.write(b, 0, tempLength);
            }
            if (reqDataByteArrayOutputStream.size() != request.getContentLength()) {// 读取失败
//                throw new RuntimeException();
            }
            string = reqDataByteArrayOutputStream.toString();
        }

        System.err.println("string:
"+string);

        return string;

    }

    public  void responseJsonResult(HttpServletResponse response, Object o)  {

        try {

            if(o!=null){
                response.getWriter().write(JsonMapper.toJsonString(o));
            }else{
                response.getWriter().write("");
            }

        }catch (IOException e){
            e.printStackTrace();
        }

    }

    public  void responseJsonResult(HttpServletResponse response, List o)  {

        try {

            if(o!=null){
                response.getWriter().write(JsonMapper.toJsonString(o));
            }else{
                response.getWriter().write("");
            }

        }catch (IOException e){
            e.printStackTrace();
        }

    }
    public  void responseJsonResult(HttpServletResponse response, Map o)  {
        try {

            if(o!=null){
                response.getWriter().write(JsonMapper.toJsonString(o));
            }else{
                response.getWriter().write("");
            }

        }catch (IOException e){
            e.printStackTrace();
        }
    }

    public  void responseStringResult(HttpServletResponse response, String result)  {

        try {

            response.getWriter().write(StringUtils.isNotBlank(result)?result:"");

        }catch (IOException e){
            e.printStackTrace();
        }

    }



    @Override
    public void afterPropertiesSet() throws Exception {

    }
}

13.String[] split = url.split("\(toast\)");
14.后台路径解码：URLDecoder.decode(task_name,"utf-8");前台：encodeURI(task.task_name)  防止中文路径乱码
15.去除以逗号分隔的字符串中开头和结尾的‘，’和中间的null

  private String checkIds(String ids) {
        boolean isOK=true;
        if(ids==null){
            ids="";
            System.err.println("id为null");
        }
        String newStr = ids.trim();
        if(newStr.startsWith(",")){
            newStr= newStr.substring(1);
            isOK=false;
        }
        if(newStr.endsWith(",")){
            newStr=newStr.substring(0,newStr.length()-1);
            isOK=false;
        }
        if(newStr.contains(",null")){
            newStr=newStr.replace(",null","");
            isOK=false;
        }
        if(newStr.contains("null,")){
            newStr=newStr.replace("null,","");
            isOK=false;
        }
        if(isOK){
            return newStr;
        }else{
            return checkIds(newStr);
        }
    }

15.list去重并保证顺序不变

 /**
     * list去重，并保证顺序不变
     * @param persons
     * @return
     */
    public static List<Serializable> removeDupliByPrassIn(List<TaskObj> persons) {
        Set set = new HashSet();
        List newList = new ArrayList();
        for (Iterator iter = persons.iterator(); iter.hasNext(); ) {
            TaskObj element = (TaskObj) iter.next();
            if (set.add(element.getProcInsId())) {
                newList.add(element);
            }
        }
        return newList;
    }

16.接口调用 get请求

String param = "{"procInsId":"" + procInsId + "","returnStr":"withdrawn","formSign":"" + formSign + ""}";
String result = HttpRequest.sendGet(withdrawnProcess_url_forOffice, "data=" + URLEncoder.encode(param, "utf-8"));

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;


public class HttpRequest {

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！"+e);
            e.printStackTrace();
        }
        //使用finally块来关闭输出流、输入流
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }


}