轉自：http://www.daxueit.com/article/2581.html
項目結構：
實現流程：
pc端：
1:打開二維碼登錄網頁index.html
2:index.html調用GetQrCodeServlet
3:GetQrCodeServlet干2件事
a:生成隨機的uuid,是一個唯一標識，該標識貫穿整個流程
b:生成二維碼圖片，二維碼信息：http://60.28.201.37:8380/QrCodeLoginPro/Login.html?uuid=" + uuid
4:index頁面展示二維碼
5:index頁面調用LongConnectionCheckServlet進行長連接輪詢操作，參數為uuid
6:LongConnectionCheckServlet只干1件事
a:拿到uuid后循環檢查loginUserMap中uuid是否不為null。
7:如果為null則代表沒有登錄，index.html將繼續進行輪詢
ps: LongConnectionCheckServlet 一個長連接請求檢測登錄狀態
loginUserMap 是一個靜態的map結構的登錄池，uuid為key , 登錄信息為value
手機端：
1:掃描pc端的二維碼
2:打開二維碼中的網頁 http://60.28.201.37:8380/QrCodeLoginPro/Login.html?uuid=" + uuid
3:登錄，將uname upwd uuid 傳遞給登錄程序PhoneLoginServlet
4:PhoneLoginServlet干2件事
a:檢測登錄
b:登錄成功后將登錄信息插入到loginUserMap中去，uuid為key
pc端：
1:繼續輪詢檢測uuid中是否為null
2:登錄后的uuid中就不為null了，此時LongConnectionCheckServlet停止循環，返回登錄狀態。
代碼：
cn.kuwo下的3個servlet
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
package
cn.kuwo;
import
java.io.IOException;
import
java.io.PrintWriter;
import
java.util.Date;
import
javax.servlet.ServletException;
import
javax.servlet.http.HttpServlet;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
cn.kuwo.util.TwoDimensionCode;
/**
* 生成二維碼圖片以及uuid
* @author zijuntang
*
*/
public
class
GetQrCodeServlet
extends
HttpServlet {
private
static
final
long
serialVersionUID = 1L;
protected
void
doGet(HttpServletRequest request,
HttpServletResponse response)
throws
ServletException, IOException {
doPost(request, response);
}
protected
void
doPost(HttpServletRequest request,
HttpServletResponse response)
throws
ServletException, IOException {
PrintWriter out = response.getWriter();
//生成唯一ID
int
uuid = (
int
) (Math.random() *
100000
);
//二維碼內容
//生成二維碼
String imgName = uuid +
"_"
+ (
int
) (
new
Date().getTime() /
1000
) +
".png"
;
String imgPath =
"/home/web/apache/htdocs/QrCodeLogin/"
+ imgName;
TwoDimensionCode handler =
new
TwoDimensionCode();
handler.encoderQRCode(content, imgPath,
"png"
);
//生成的圖片訪問地址
String jsonStr =
"{\"uuid\":"
+ uuid +
",\"qrCodeImg\":\""
+ qrCodeImg +
"\"}"
;
out.print(jsonStr);
out.flush();
out.close();
}
}
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
package
cn.kuwo;
import
java.io.IOException;
import
java.io.PrintWriter;
import
java.util.Date;
import
javax.servlet.ServletException;
import
javax.servlet.http.HttpServlet;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
cn.kuwo.vo.LoginUserVo;
import
cn.kuwo.vo.UserVo;
/**
* 用長連接，檢查登錄狀態
* @author zijuntang
*
*/
public
class
LongConnectionCheckServlet
extends
HttpServlet {
private
static
final
long
serialVersionUID = 1L;
public
void
doGet(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
doPost(request, response);
}
public
void
doPost(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
String uuid = request.getParameter(
"uuid"
);
String jsonStr =
""
;
System.out.println(
"in"
);
System.out.println(
"uuid:"
+ uuid);
long
inTime =
new
Date().getTime();
Boolean bool =
true
;
while
(bool) {
try
{
Thread.sleep(
1000
);
}
catch
(InterruptedException e) {
e.printStackTrace();
}
//檢測登錄
UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);
System.out.println(
"userVo:"
+ userVo);
if
(userVo !=
null
){
bool =
false
;
jsonStr =
"{\"uname\":\""
+userVo.getUname()+
"\"}"
;
LoginUserVo.getLoginUserMap().remove(uuid);
}
else
{
if
(
new
Date().getTime() - inTime >
5000
){
bool =
false
;
}
}
}
System.out.println(
"login ok : "
+ jsonStr);
PrintWriter out = response.getWriter();
out.print(jsonStr);
out.flush();
out.close();
}
}
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
package
cn.kuwo;
import
java.io.IOException;
import
java.io.PrintWriter;
import
javax.servlet.ServletException;
import
javax.servlet.http.HttpServlet;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
cn.kuwo.vo.LoginUserVo;
import
cn.kuwo.vo.UserVo;
/**
* 二維碼手機端登錄
* @author zijuntang
*
*/
public
class
PhoneLoginServlet
extends
HttpServlet {
private
static
final
long
serialVersionUID = 1L;
public
PhoneLoginServlet() {
super
();
// TODO Auto-generated constructor stub
}
protected
void
doGet(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
doPost(request, response);
}
protected
void
doPost(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException {
String uuid = request.getParameter(
"uuid"
);
String uname = request.getParameter(
"uname"
);
String upwd = request.getParameter(
"upwd"
);
System.out.println(uuid);
System.out.println(uname);
System.out.println(upwd);
//TODO 驗證登錄
boolean
bool =
true
;
if
(bool){
//將登陸信息存入map
UserVo userVo = LoginUserVo.getLoginUserMap().get(uuid);
if
(userVo ==
null
){
userVo =
new
UserVo();
userVo.setUname(uname);
userVo.setUpwd(upwd);
LoginUserVo.getLoginUserMap().put(uuid, userVo);
}
}
PrintWriter out = response.getWriter();
out.print(bool);
out.flush();
out.close();
}
}
|
cn.kuwo.util包下的生成二維碼的封裝類
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
package
cn.kuwo.util;
import
java.awt.Color;
import
java.awt.Graphics2D;
import
java.awt.image.BufferedImage;
import
java.io.File;
import
java.io.IOException;
import
java.io.InputStream;
import
java.io.OutputStream;
import
javax.imageio.ImageIO;
import
jp.sourceforge.qrcode.QRCodeDecoder;
import
jp.sourceforge.qrcode.exception.DecodingFailedException;
import
com.swetake.util.Qrcode;
public
class
TwoDimensionCode {
/**
* 生成二維碼(QRCode)圖片
* @param content 存儲內容
* @param imgPath 圖片路徑
*/
public
void
encoderQRCode(String content, String imgPath) {
this
.encoderQRCode(content, imgPath,
"png"
,
7
);
}
/**
* 生成二維碼(QRCode)圖片
* @param content 存儲內容
* @param output 輸出流
*/
public
void
encoderQRCode(String content, OutputStream output) {
this
.encoderQRCode(content, output,
"png"
,
7
);
}
/**
* 生成二維碼(QRCode)圖片
* @param content 存儲內容
* @param imgPath 圖片路徑
* @param imgType 圖片類型
*/
public
void
encoderQRCode(String content, String imgPath, String imgType) {
this
.encoderQRCode(content, imgPath, imgType,
7
);
}
/**
* 生成二維碼(QRCode)圖片
* @param content 存儲內容
* @param output 輸出流
* @param imgType 圖片類型
*/
public
void
encoderQRCode(String content, OutputStream output, String imgType) {
this
.encoderQRCode(content, output, imgType,
7
);
}
/**
* 生成二維碼(QRCode)圖片
* @param content 存儲內容
* @param imgPath 圖片路徑
* @param imgType 圖片類型
* @param size 二維碼尺寸
*/
public
void
encoderQRCode(String content, String imgPath, String imgType,
int
size) {
try
{
BufferedImage bufImg =
this
.qRCodeCommon(content, imgType, size);
File imgFile =
new
File(imgPath);
if
(!imgFile.exists())
{
imgFile.mkdirs();
}
// 生成二維碼QRCode圖片
ImageIO.write(bufImg, imgType, imgFile);
}
catch
(Exception e) {
e.printStackTrace();
}
}
/**
* 生成二維碼(QRCode)圖片
* @param content 存儲內容
* @param output 輸出流
* @param imgType 圖片類型
* @param size 二維碼尺寸
*/
public
void
encoderQRCode(String content, OutputStream output, String imgType,
int
size) {
try
{
BufferedImage bufImg =
this
.qRCodeCommon(content, imgType, size);
// 生成二維碼QRCode圖片
ImageIO.write(bufImg, imgType, output);
}
catch
(Exception e) {
e.printStackTrace();
}
}
/**
* 生成二維碼(QRCode)圖片的公共方法
* @param content 存儲內容
* @param imgType 圖片類型
* @param size 二維碼尺寸
* @return
*/
private
BufferedImage qRCodeCommon(String content, String imgType,
int
size) {
BufferedImage bufImg =
null
;
try
{
Qrcode qrcodeHandler =
new
Qrcode();
// 設置二維碼排錯率，可選L(7%)、M(15%)、Q(25%)、H(30%)，排錯率越高可存儲的信息越少，但對二維碼清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect(
'M'
);
qrcodeHandler.setQrcodeEncodeMode(
'B'
);
// 設置設置二維碼尺寸，取值范圍1-40，值越大尺寸越大，可存儲的信息越大
qrcodeHandler.setQrcodeVersion(size);
// 獲得內容的字節數組，設置編碼格式
byte
[] contentBytes = content.getBytes(
"utf-8"
);
// 圖片尺寸
int
imgSize =
67
+
12
* (size -
1
);
bufImg =
new
BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
// 設置背景顏色
gs.setBackground(Color.WHITE);
gs.clearRect(
0
,
0
, imgSize, imgSize);
// 設定圖像顏色> BLACK
gs.setColor(Color.BLACK);
// 設置偏移量，不設置可能導致解析出錯
int
pixoff =
2
;
// 輸出內容> 二維碼
if
(contentBytes.length >
0
&& contentBytes.length <
800
) {
boolean
[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for
(
int
i =
0
; i < codeOut.length; i++) {
for
(
int
j =
0
; j < codeOut.length; j++) {
if
(codeOut[j][i]) {
gs.fillRect(j *
3
+ pixoff, i *
3
+ pixoff,
3
,
3
);
}
}
}
}
else
{
throw
new
Exception(
"QRCode content bytes length = "
+ contentBytes.length +
" not in [0, 800]."
);
}
gs.dispose();
bufImg.flush();
}
catch
(Exception e) {
e.printStackTrace();
}
return
bufImg;
}
/**
* 解析二維碼（QRCode）
* @param imgPath 圖片路徑
* @return
*/
public
String decoderQRCode(String imgPath) {
// QRCode 二維碼圖片的文件
File imageFile =
new
File(imgPath);
BufferedImage bufImg =
null
;
String content =
null
;
try
{
bufImg = ImageIO.read(imageFile);
QRCodeDecoder decoder =
new
QRCodeDecoder();
content =
new
String(decoder.decode(
new
TwoDimensionCodeImage(bufImg)),
"utf-8"
);
}
catch
(IOException e) {
System.out.println(
"Error: "
+ e.getMessage());
e.printStackTrace();
}
catch
(DecodingFailedException dfe) {
System.out.println(
"Error: "
+ dfe.getMessage());
dfe.printStackTrace();
}
return
content;
}
/**
* 解析二維碼（QRCode）
* @param input 輸入流
* @return
*/
public
String decoderQRCode(InputStream input) {
BufferedImage bufImg =
null
;
String content =
null
;
try
{
bufImg = ImageIO.read(input);
QRCodeDecoder decoder =
new
QRCodeDecoder();
content =
new
String(decoder.decode(
new
TwoDimensionCodeImage(bufImg)),
"utf-8"
);
}
catch
(IOException e) {
System.out.println(
"Error: "
+ e.getMessage());
e.printStackTrace();
}
catch
(DecodingFailedException dfe) {
System.out.println(
"Error: "
+ dfe.getMessage());
dfe.printStackTrace();
}
return
content;
}
public
static
void
main(String[] args) {
String imgPath =
"D:/aaa/Michael_QRCode.png"
;
TwoDimensionCode handler =
new
TwoDimensionCode();
handler.encoderQRCode(encoderContent, imgPath,
"png"
);
/*
System.out.println("========encoder success");
String decoderContent = handler.decoderQRCode(imgPath);
System.out.println("解析結果如下：");
System.out.println(decoderContent);
System.out.println("========decoder success!!!");
*/
}
}
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
package
cn.kuwo.util;
import
java.awt.image.BufferedImage;
import
jp.sourceforge.qrcode.data.QRCodeImage;
public
class
TwoDimensionCodeImage
implements
QRCodeImage {
BufferedImage bufImg;
public
TwoDimensionCodeImage(BufferedImage bufImg) {
this
.bufImg = bufImg;
}
@Override
public
int
getHeight() {
return
bufImg.getHeight();
}
@Override
public
int
getPixel(
int
x,
int
y) {
return
bufImg.getRGB(x, y);
}
@Override
public
int
getWidth() {
return
bufImg.getWidth();
}
}
|
cn.kuwo.vo下的2個數據層
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
|
package
cn.kuwo.vo;
import
java.util.HashMap;
public
class
LoginUserVo {
private
static
HashMap<String, UserVo> loginUserMap =
new
HashMap<String, UserVo>();
private
static
LoginUserVo loginUserVo;
public
static
LoginUserVo getVo(){
if
(loginUserVo ==
null
){
loginUserVo =
new
LoginUserVo();
}
return
loginUserVo;
}
public
static
HashMap<String, UserVo> getLoginUserMap() {
return
loginUserMap;
}
}
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
package
cn.kuwo.vo;
public
class
UserVo {
private
String uname;
private
String upwd;
public
String getUname() {
return
uname;
}
public
void
setUname(String uname) {
this
.uname = uname;
}
public
String getUpwd() {
return
upwd;
}
public
void
setUpwd(String upwd) {
this
.upwd = upwd;
}
}
|
2個網頁
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
<!DOCTYPE html>
<html>
<head>
<meta charset=
"UTF-8"
>
<title>Insert title here</title>
</head>
<script type=
"text/javascript"
src=
"js/jquery-1.11.0.min.js"
></script>
<body>
<div id=
"divCon"
>
<img src=
""
id=
"QrCodeImg"
/>
</div>
</body>
<script type=
"text/javascript"
>
$(document).ready(function() {
var uuid;
$.get(
"/QrCodeLoginPro/GetQrCodeServlet"
, function(data, status) {
var obj = eval(
"("
+ data +
")"
);
//存儲UUID
uuid = obj.uuid;
//顯示二維碼
$(
"#QrCodeImg"
).attr(
"src"
, obj.qrCodeImg);
//開始驗證登錄
validateLogin();
});
function validateLogin(){
$.get(
"/QrCodeLoginPro/LongConnectionCheckServlet?uuid="
+ uuid , function(data, status) {
if
(data ==
""
){
validateLogin();
}
else
{
var obj = eval(
"("
+ data +
")"
);
alert(
"登錄成功了:"
+ obj.uname);
}
});
}
});
</script>
</html>
|
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
<!DOCTYPE html>
<html>
<head>
<meta charset=
"UTF-8"
>
<title>Insert title here</title>
</head>
<style>
.l_m_l {
float
: left;
font-size: 14px;
padding: 5px
0
0
0
;
width: 330px;
color: #
414141
;
}
.l_m_linput {
height: 31px;
position: relative;
width: 300px;
margin-bottom: 21px;
}
.l_m_linput span {
float
: left;
width: 78px;
text-align: right;
line-height: 31px;
}
input {
float
: left;
width: 195px;
height: 24px;
line-height: 24px;
background: #f2f2f2;
border: 1px solid #c4c4c4;
padding: 2px 22px 2px 2px;
}
.l_mimacon {
position: absolute;
top: 6px;
right: 6px;
width: 15px;
height: 17px;
background: url(img/l_mimacon.png)
no-repeat;
}
.l_peoplecon {
position: absolute;
top: 7px;
right: 6px;
width: 15px;
height: 15px;
background: url(img/l_peoplecon.png)
no-repeat;
}
.l_m_lload a {
display: block;
width: 154px;
height: 40px;
background:
url(img/l_loadingbtn.png)
no-repeat;
margin:
0
auto;
line-height: 40px;
text-align: center;
font-size: 18px;
color: #52340c;
text-decoration: none;
}
</style>
<script type=
"text/javascript"
src=
"js/jquery-1.11.0.min.js"
></script>
<body style=
" border-top-right-radius: 0px !important; border-bottom-right-radius: 0px !important; border-bottom-left-radius: 0px !important; background-image: none !important; border: 0px !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; line-height: 1.1em !important; margin: 0px !important; outline: 0px !important; overflow: visible !important; padding: 0px !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; width: auto !important; box-sizing: content-box !important; font-family: Consolas, 'Bitstream Vera Sans Mono', 'Courier New', Courier, monospace !important; font-size: 1em !important; min-height: inherit !important;">>
<div style=
"margin-left: 100px;"
><img src=
"img/logo.png"
/></div>
<div >
<p
class
=
"l_m_linput"
>
<span><font color=
"#fff"
>用戶名：</font></span><input type=
"text"
id=
"login_name"
value=
"zijuntang"
><em
class
=
"l_peoplecon"
></em>
</p>
<p
class
=
"l_m_linput"
>
<span><font color=
"#fff"
>密碼：</font></span><input type=
"password"
id=
"login_psw"
value=
"tangzijun"
><em
class
=
"l_mimacon"
></em>
</p>
<div
class
=
"l_m_linput2"
></div>
<div
class
=
"l_m_lload"
>
<a href=
"javascript:login();"
>登錄</a>
</div>
</div>
</body>
<script type=
"text/javascript"
>
//登錄
function login(){
$.post(
"/QrCodeLoginPro/PhoneLoginServlet"
, {
uuid : $.getUrlParam(
'uuid'
),
uname:$(
"#login_name"
).val(),
upwd:$(
"#login_psw"
).val()
}, function(data, status) {
if
(data ==
""
){
alert(
"登錄失敗"
);
}
else
{
alert(
"登錄成功"
);
}
});
}
//獲取網頁參數
(function($){
$.getUrlParam = function(name){
var reg =
new
RegExp(
"(^|&)"
+ name +
"=([^&]*)(&|$)"
);
var r = window.location.search.substr(
1
).match(reg);
if
(r!=
null
)
return
unescape(r[
2
]);
return
null
;
}
})(jQuery);
</script>
</html>
|
web.xml配置文件
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
<?xml version=
"1.0"
encoding=
"UTF-8"
?>
<web-app xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id=
"WebApp_ID"
version=
"2.5"
>
<display-name>QrCodeLoginPro</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>長連接檢查登錄狀態</display-name>
<servlet-name>LongConnectionCheckServlet</servlet-name>
<servlet-
class
>cn.kuwo.LongConnectionCheckServlet</servlet-
class
>
</servlet>
<servlet-mapping>
<servlet-name>LongConnectionCheckServlet</servlet-name>
<url-pattern>/LongConnectionCheckServlet</url-pattern>
</servlet-mapping>
<servlet>
<description>獲取二維碼圖片以及uuid</description>
<display-name>GetQrCodeServlet</display-name>
<servlet-name>GetQrCodeServlet</servlet-name>
<servlet-
class
>cn.kuwo.GetQrCodeServlet</servlet-
class
>
</servlet>
<servlet-mapping>
<servlet-name>GetQrCodeServlet</servlet-name>
<url-pattern>/GetQrCodeServlet</url-pattern>
</servlet-mapping>
<servlet>
<description>手機掃描二維碼之后進行登錄</description>
<display-name>PhoneLoginServlet</display-name>
<servlet-name>PhoneLoginServlet</servlet-name>
<servlet-
class
>cn.kuwo.PhoneLoginServlet</servlet-
class
>
</servlet>
<servlet-mapping>
<servlet-name>PhoneLoginServlet</servlet-name>
<url-pattern>/PhoneLoginServlet</url-pattern>
</servlet-mapping>
</web-app>
|
此外還需要1個二維碼開源包：QRCode.jar
源碼下載：http://files.cnblogs.com/zijun/%E4%BA%8C%E7%BB%B4%E7%A0%81%E7%99%BB%E5%BD%95%E4%BE%8B%E5%AD%90.rar