API開發實踐(四) 返回HTML
阿新 • • 發佈:2017-05-21
acea 指定 win filename static box 拖動地圖 ive let 【地圖API】地址錄入時如何獲得準確的經緯度?淘寶收貨地址詳解
分為兩個部分:生成HTML和返回HTML
生成HTML:
最終想要的時顯示地圖,不可避免的使用高德地圖的API。
【地圖API】地址錄入時如何獲得準確的經緯度?淘寶收貨地址詳解
改變幾個參數即可達到目的,很簡單不講了。
重點說說如何生成查詢結果對應的HTML:
將HTML中的內容保存為String,在String格式的基礎上替換關鍵參數,即可批量生產。
在將HTML保存為String時,因為HTML內容都是帶換行縮進的,還帶有許多雙引號,所以直接粘貼實不可取的。
我用的方法是將內容先保存在文本中,再通過IO流讀取,並且一定要做到:
刪除所有換行符
將雙引號替換為單引號
將所有註釋都去掉
否則不滿足前兩條,String格式會報錯;
不滿足最後一條,輸出的時候因為沒有換行符,“//”又是行註釋,會導致把第一個“//”後的所有內容都認為是註釋而無法執行。
代碼:getHtml.java
1 package util; 2 3 import java.util.List; 4 import java.util.regex.Pattern; 5 6 public class getHtml { 7 public getHtml(){} 8 public String creatHtml(List<String> list){ 9 String html = null; 10 String add = ""; 11 int j = list.size(); 12 for(int i = 1; i < j ; i++ ){ 13 if(i != j - 1){ 14 add = add + list.get(i) + "--->"; 15 }else{ 16 add = add + list.get(i);} 17 } 18 String address = list.get(j-1);19 html = "<html> <head> <base href=‘<%=basePath%>‘> <meta http-equiv=‘pragma‘ content=‘no-cache‘> <meta http-equiv=‘cache-control‘ content=‘no-cache‘> <meta http-equiv=‘expires‘ content=‘0‘> <meta http-equiv=‘keywords‘ content=‘keyword1,keyword2,keyword3‘> <meta http-equiv=‘description‘ content=‘This is my page‘> <script type=‘text/javascript‘ src=‘http://webapi.amap.com/maps?v=1.3&key=0250860ccb5953fa5d655e8acf40ebb7&plugin=AMap.Geocoder‘></script> <script type=‘text/javascript‘ src=‘http://cache.amap.com/lbs/static/addToolbar.js‘></script> <style> #addressBox{height:20px;width:600px;} #mapBox{height:400px;width:600px} #pointBox{height:20px;width:600px;} </style> <!-- <link rel=‘stylesheet‘ type=‘text/css‘ href=‘styles.css‘> --> </head> <body onload=‘geocoder();‘> " 20 + " <p>物流軌跡:</p> " 21 + "<p>"+add+"</p>" 22 + "<div> <p>當前所在位置</p> </div> <div id=‘pointBox‘> </div> <div id=‘mapBox‘></div> <div> 如果不夠準確,可以拖動地圖改變經緯度 </div> " 23 + "<script type=‘text/javascript‘> var address =‘"+address 24 + "‘;var $pointBox = document.getElementById(‘pointBox‘); var map = new AMap.Map(‘mapBox‘, { resizeEnable: true, center: [116.397428, 39.90923], zoom:14 }); function addMarker(point) { var marker = new AMap.Marker({ map: map, position: [ point.getLng(), point.getLat()] }); } function addCenterPoint(){ map.clearMap(); var centerPoint = map.getCenter(); addMarker(centerPoint); $pointBox.innerHTML = ‘當前經緯度為:‘ + centerPoint.getLng() + ‘,‘ + centerPoint.getLat(); } addCenterPoint(); function geocoder() { map.clearMap(); var myGeo = new AMap.Geocoder(); myGeo.getLocation(address, function(status, result) { if (status === ‘complete‘ && result.info === ‘OK‘) { geocoder_CallBack(result); }else{ $pointBox.innerHTML = ‘查無此地址‘; } }); } function geocoder_CallBack(data) { var resultStr = ‘‘; var geocode = data.geocodes; addMarker(geocode[0].location); resultStr += ‘當前坐標</b>:‘ + geocode[0].location.getLng() + ‘, ‘ + geocode[0].location.getLat(); map.setFitView(); $pointBox.innerHTML = resultStr; } map.on(‘moveend‘, function() { addCenterPoint(); }); </script> </body></html>"; 25 String str = html.replaceAll( "\‘", "\""); 26 return str; 27 } 28 }
大家可以看到String html定義哪一行是如何處理更改參數和處理格式的。可以和最開始鏈接中的代碼進行對比。
返回HTML:
不說了,直接代碼:getMap.java
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String shipperCode = request.getParameter("ShipperCode"); String logisticCode = request.getParameter("LogisticCode"); System.out.println(shipperCode+","+logisticCode); kdniaoTrackQueryAPI kdnAPI = new kdniaoTrackQueryAPI(); List<String> result = kdnAPI.Return(shipperCode,logisticCode); String name = ""; if(result.get(0).equals("0")){ name = "<html><head><title>t.html</title></head><body>"+result.get(1)+"<br></body></html>"; }else if(result.get(0).equals("1")){ getHtml gH = new getHtml(); name = gH.creatHtml(result); }else{ name = "<html><head><title>t.html</title></head><body>"+result.get(1)+"<br></body></html>"; } //返回文本數據 response.setContentType("text/plain;charset=UTF-8"); ServletOutputStream outputStream = response.getOutputStream(); outputStream.write(name.getBytes("UTF-8")); outputStream.flush(); outputStream.close(); }
隨便查查就有返回的方法
調用方法實例:
如何調用我的API
1 package test; 2 import java.io.BufferedReader; 3 import java.io.File; 4 import java.io.FileWriter; 5 import java.io.IOException; 6 import java.io.InputStreamReader; 7 import java.io.OutputStreamWriter; 8 import java.io.PrintWriter; 9 import java.net.HttpURLConnection; 10 import java.net.URL; 11 import java.net.URLEncoder; 12 import java.util.Map; 13 14 public class test1 { 15 public static void main(String args[]){ 16 //請求url 17 String URL="安全起見,不可說,等我發布前端地址"; 18 String ShipperCode = ""//物理公司編號; 19 String LogisticCode = ""//物流運單號; 20 String ReqURL = URL + "?ShipperCode=" + ShipperCode + "&LogisticCode=" + LogisticCode; 21 String result = sendPost(ReqURL); 22 write(result,"test"); 23 } 24 /** 25 * 向指定 URL 發送POST方法的請求 26 * @return 遠程資源的響應結果 27 */ 28 private static String sendPost(String url) { 29 OutputStreamWriter out = null; 30 BufferedReader in = null; 31 StringBuilder result = new StringBuilder(); 32 try { 33 URL realUrl = new URL(url); 34 HttpURLConnection conn =(HttpURLConnection) realUrl.openConnection(); 35 // 發送POST請求必須設置如下兩行 36 conn.setDoOutput(true); 37 conn.setDoInput(true); 38 // POST方法 39 conn.setRequestMethod("POST"); 40 // 設置通用的請求屬性 41 conn.setRequestProperty("accept", "*/*"); 42 conn.setRequestProperty("connection", "Keep-Alive"); 43 conn.setRequestProperty("user-agent", 44 "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); 45 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 46 conn.setRequestProperty("kdniao-nocache", "true"); 47 conn.connect(); 48 // 獲取URLConnection對象對應的輸出流 49 out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8"); 50 // 定義BufferedReader輸入流來讀取URL的響應 51 in = new BufferedReader( 52 new InputStreamReader(conn.getInputStream(), "UTF-8")); 53 String line; 54 while ((line = in.readLine()) != null) { 55 result.append(line); 56 } 57 } catch (Exception e) { 58 e.printStackTrace(); 59 } 60 //使用finally塊來關閉輸出流、輸入流 61 finally{ 62 try{ 63 if(out!=null){ 64 out.close(); 65 } 66 if(in!=null){ 67 in.close(); 68 } 69 } 70 catch(IOException ex){ 71 ex.printStackTrace(); 72 } 73 } 74 return result.toString(); 75 } 76 /*@result 服務器返回的html 77 [email protected] 保存的文件名字 78 * */ 79 public static void write(String result,String fileName) { 80 FileWriter fw = null; 81 try { 82 //如果文件存在,則追加內容;如果文件不存在,則創建文件 83 File f=new File("E:\\"+fileName+".html"); 84 fw = new FileWriter(f, true); 85 } catch (IOException e) { 86 e.printStackTrace(); 87 } 88 PrintWriter pw = new PrintWriter(fw); 89 pw.print(result); 90 pw.flush(); 91 try { 92 fw.flush(); 93 pw.close(); 94 fw.close(); 95 } catch (IOException e) { 96 e.printStackTrace(); 97 } 98 } 99 }
API開發實踐(四) 返回HTML