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浅谈JSP表单中的form传值[转]

不同JSP页面之间、不同action之间,以及JSP中form与其对应的action之间,JSP中form与其不对应的action之间如何传值。本文将介绍JSP表单中的form传值。
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SP表单中的form传值
页面间链接和数据传递的三种方式
（1）通过JSP表单form将数据提交到下一个页面；
（2）通过JSP表单链接将数据提交到下一个页面；
（3）通过JSP表单Session将数据提交到后续页面，session是一次会话只要浏览器不关闭就不会关闭会话，一般默认保存30分钟可以根据自己的需要更改 。
例：
    

  1. 01.html  
    2. 

  2. <html> 
    3. 

  3. <head> 
    4. 

  4. <title>利用表单传递数据</title> 
    5. 

  5. </head> 
    6. 

  6. <body> 
    7. 

  7. <h3>利用表单传递数据</h3> 
    8. 

  8. <form name="form1" method="post" action="02.jsp"> 
    9. 

  9. <p>你的姓名：  
    10. 

  10.      <input type="text" name="name"> 
    11. 

  11. </p> 
    12. 

  12. <p>你的爱好：  
    13. 

  13.      <input type="text" name="hobby"> 
    14. 

  14. </p> 
    15. 

  15. <p>你所从事的行业：  
    16. 

  16.      <select name="work"> 
    17. 

  17.            <option></option>  
    18. 

  18.         <option value="学生">学生</option> 
    19. 

  19.         <option value="IT业">IT业</option> 
    20. 

  20.         <option value="商业">商业</option> 
    21. 

  21.         <option value="制造业">制造业</option> 
    22. 

  22.         <option value="服务业">服务业</option> 
    23. 

  23.      </select> 
    24. 

  24. </p> 
    25. 

  25. <p> 
    26. 

  26.      <input type="Submit" value="提交"> 
    27. 

  27.      <input type="Reset" value="重置"> 
    28. 

  28. </p> 
    29. 

  29. </form> 
    30. 

  30. </body> 
    31. 

  31. </html> 
    32. 

  32. 02.jsp  
    33. 

  33. <html> 
    34. 

  34. <head> 
    35. 

  35. <title>从表单中获取数据</title> 
    36. 

  36. </head> 
    37. 

  37. <%@ page contentType="text/html;charset=GB2312"%> 
    38. 

  38. <body> 
    39. 

  39. <h3>从表单中获取数据</h3> 
    40. 

  40. <p> 
    41. 

  41. <%  
    42. 

  42.    //从表单中获取数据  
    43. 

  43.    String name= request.getParameter("name");  
    44. 

  44.    String hobby=request.getParameter("hobby");  
    45. 

  45.    String work= request.getParameter("work");  
    46. 

  46.    //验证"名字(name)"的长度是否符合要求  
    47. 

  47.    if(name.length()<3||name.length()>8)  
    48. 

  48.       out.println("你输入的名字长度不符合要求");  
    49. 

  49.    else  
    50. 

  50.    {  
    51. 

  51.       out.println("你的姓名是："+name+"<br>");  
    52. 

  52.         out.println("你的爱好是："+hobby+"<br>");  
    53. 

  53.       out.println("你所从事的工作是："+work+"<br>");  
    54. 

  54.       //将"名字(name)"保存到session对象中,让后续页面(下个页面、下下个页面、……)引用  
    55. 

  55.       session.setAttribute("name",name);  
    56. 

  56.    }  
    57. 

  57. %> 
    58. 

  58. <br> 
    59. 

  59.  
    60. 

  60. <a href="03.jsp?hobby=<%=hobby%>&work=<%=work%>">提交</a> 
    61. 

  61. </p> 
    62. 

  62. <hr> 
    63. 

  63. <p><font size="2">*将"名字(name)"保存到session对象中,让后续页面(下个页面、下下个页面、……)引用</font></p> 
    64. 

  64. <p><font size="2">*将"爱好(hobby)"和"工作(work)"以链接的形式递给下个页面</font></p> 
    65. 

  65. </body> 
    66. 

  66. </html> 
    67. 

  67. 3.jsp  
    68. 

  68. <html> 
    69. 

  69. <head> 
    70. 

  70. <title>从session对象中获取"名字(name)"的值;从链接中获取"爱好(hobby)"和"工作(work)"</title> 
    71. 

  71. </head> 
    72. 

  72. <%@ page contentType="text/html;charset=GB2312"%> 
    73. 

  73. <SCRIPT language="JavaScript"> 
    74. 

  74.      function submit1()  
    75. 

  75.         {  
    76. 

  76.          document.forms["form1"].action="04.jsp";  
    77. 

  77.         document.form1.submit();  
    78. 

  78.         }  
    79. 

  79.  
    80. 

  80.         
    81. 

  81.         function edit1()  
    82. 

  82.         {  
    83. 

  83.           document.forms["form1"].action="01.jsp";  
    84. 

  84.        document.form1.submit();  
    85. 

  85.         }  
    86. 

  86. </SCRIPT> 
    87. 

  87. <%@ page contentType="text/html;charset=GB2312" %> 
    88. 

  88. <body> 
    89. 

  89. <h3>从session对象中获取"名字(name)"的值;从链接中获取"爱好(hobby)"和"工作(work)"</h3> 
    90. 

  90. <%  
    91. 

  91.    String name=(String)session.getAttribute("name");  
    92. 

  92.    String hobby=request.getParameter("hobby");  
    93. 

  93.    String work= request.getParameter("work");  
    94. 

  94.    out.println("你的姓名是："+name+"<br>");  
    95. 

  95.    out.println("你的爱好是："+hobby+"<br>");  
    96. 

  96.    out.println("你所从事的工作是："+work+"<br>");  
    97. 

  97.    //将"爱好(hobby)"和"工作(work)"保存在session对象中  
    98. 

  98.    session.setAttribute("hobby",hobby);  
    99. 

  99.   session.setAttribute("work",work);  
    100. 

  100. %> 
    101. 

  101. <form name="form1" method="post"> 
    102. 

  102. <input type="hidden" name="name" value="<%=name%>"> 
    103. 

  103. <input type="hidden" name="hobby" value="<%=hobby%>"> 
    104. 

  104. <input type="hidden" name="work" value="<%=work%>"> 
    105. 

  105. <p><h3>确认提交这些信息吗？</h3></p> 
    106. 

  106. <input type="Button" name="Submit" value="确认" onClick="javascript:submit1()"> 
    107. 

  107. <input type="Button" name="Edit" value="修改" onClick="javascript:edit1()"> 
    108. 

  108. </form> 
    109. 

  109. <hr> 
    110. 

  110. <p><font size="2">*将"爱好(hobby)"和"工作(work)"保存在session对象中,让后续页面(下个页面、下下个页面、……)引用</font></p> 
    111. 

  111. <p><font size="2">*由于"名字(name)"在上个页面中已经保存在session对象中了,这里没必要再次保存</font></p> 
    112. 

  112. </body> 
    113. 

  113. </html> 
    114. 

  114. 4.jsp  
    115. 

  115. <html> 
    116. 

  116. <head> 
    117. 

  117. <title>从sessoin对象中获取数据</title> 
    118. 

  118. </head> 
    119. 

  119. <%@ page contentType="text/html;charset=GB2312" %> 
    120. 

  120. <body> 
    121. 

  121. <h3>从sessoin对象中获取数据</h3> 
    122. 

  122. <%  
    123. 

  123.    //从sessoin对象中获取数据  
    124. 

  124.    String name=(String)session.getAttribute("name");  
    125. 

  125.    String work=(String)session.getAttribute("work");  
    126. 

  126.    String hobby=(String)session.getAttribute("hobby");  
    127. 

  127. %> 
    128. 

  128. <p> 
    129. 

  129. <font color="#0000FF"><%=name%></font>，你好！你所从事的工作是<font color="#0000FF"><%=work%></font>，在业余时间喜欢<font color="#0000FF"><%=hobby%></font>。  
    130. 

  130. </p> 
    131. 

  131. </body> 
    132. 

  132. </html> 
    133. 

  133. 1.jsp  
    134. 

  134. <html> 
    135. 

  135. <head> 
    136. 

  136. <title>利用表单传递数据</title> 
    137. 

  137. </head> 
    138. 

  138. <%@ page contentType="text/html;charset=GB2312" %> 
    139. 

  139. <%  
    140. 

  140.    String name=request.getParameter("name");  
    141. 

  141.    String hobby=request.getParameter("hobby");  
    142. 

  142.    String work=new String(request.getParameter("work").getBytes("ISO8859_1"),"GBK");  
    143. 

  143. %> 
    144. 

  144. <body> 
    145. 

  145. <h3>利用表单传递数据</h3> 
    146. 

  146. <form name="form1" method="post" action="02.jsp"> 
    147. 

  147. <p>你的姓名：  
    148. 

  148.      <input type="text" name="name" value="<%=name%>"> 
    149. 

  149. </p> 
    150. 

  150. <p>你的爱好：  
    151. 

  151.      <input type="text" name="hobby" value="<%=hobby%>"> 
    152. 

  152. </p> 
    153. 

  153. <p>你所从事的行业：  
    154. 

  154.      <select name="work"> 
    155. 

  155.           <%if(work.equals("学生")){%> 
    156. 

  156.         <option value="学生" selected>学生</option> 
    157. 

  157.         <option value="IT业">IT业</option> 
    158. 

  158.         <option value="商业">商业</option> 
    159. 

  159.         <option value="制造业">制造业</option> 
    160. 

  160.         <option value="服务业">服务业</option> 
    161. 

  161.           <%}else if(work.equals("IT业")){%> 
    162. 

  162.         <option value="学生">学生</option> 
    163. 

  163.         <option value="IT业" selected>IT业</option> 
    164. 

  164.         <option value="商业">商业</option> 
    165. 

  165.         <option value="制造业">制造业</option> 
    166. 

  166.         <option value="服务业">服务业</option> 
    167. 

  167.           <%}else if(work.equals("商业")){%> 
    168. 

  168.         <option value="学生">学生</option> 
    169. 

  169.         <option value="IT业">IT业</option> 
    170. 

  170.         <option value="商业" selected>商业</option> 
    171. 

  171.         <option value="制造业">制造业</option> 
    172. 

  172.         <option value="服务业">服务业</option> 
    173. 

  173.           <%}else if(work.equals("制造业")){%> 
    174. 

  174.         <option value="学生">学生</option> 
    175. 

  175.         <option value="IT业">IT业</option> 
    176. 

  176.         <option value="商业">商业</option> 
    177. 

  177.        <option value="制造业" selected>制造业</option> 
    178. 

  178.         <option value="服务业">服务业</option> 
    179. 

  179.               <%}else if(work.equals("服务业")){%> 
    180. 

  180.         <option value="学生">学生</option> 
    181. 

  181.        <option value="IT业">IT业</option> 
    182. 

  182.         <option value="商业">商业</option> 
    183. 

  183.         <option value="制造业">制造业</option> 
    184. 

  184.         <option value="服务业" selected>服务业</option> 
    185. 

  185.               <%}%> 
    186. 

  186.      </select> 
    187. 

  187. </p> 
    188. 

  188. <p> 
    189. 

  189.      <input type="Submit" value="提交"> 
    190. 

  190.      <input type="Reset" value="重置"> 
    191. 

  191. </p> 
    192. 

  192. </form> 
    193. 

  193. </body> 
    194. 

  194. </html> 
    195.
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