如何選擇一個選項標記值可以在兩個或更多的JSP頁面

purchase.jsp如何選擇一個選項標記值可以在兩個或更多的JSP頁面

<form action="view.jsp" method="post"> 
    <select id='category'> 
    <option value=""> Make a selection </option> 
    <option value='company'>company</option> 
    <option value='institution'>institution</option> 
    <option value='hospital'>hospital</option> 
    <option value='Others'>Others</option> 
    </select> 
    <input type = "submit" value="Submit" 
    </form>

view.jsp的

<script type="text/javascript"> 

     function setAction(nPage){ 

      document.forms[0].action = nPage; 
     } 
    </script> 
<form> 
    <select onchange="setAction(this.value)"> 
    <option value=''> Make a selection </option> 
    <option value='PDF2.jsp'> PDF</option> 
    <option value='XLS2.jsp'> XLS </option> 
    <option value='DOC.jsp'> DOC </option> 
    <option value='XLSX2.jsp'> XLSX </option> 
    </select> 
<input type="submit" value="Submit"> 
</form>

檢索起初，我將從purchase.jsp，我選擇公司將點擊提交，它會去view.jsp，我會再次選擇PDF2.jsp，並點擊提交它將會l去PDF2.jsp page.Now我的問題是如何打印公司，我選擇purchase.jsp到PDF2.jsp。所以這裏有3個jsp頁面，第一個jsp頁面中選擇的值應該打印在第三個jsp頁面中，但是應該從第一個jsp（purchase.jsp）到第二個jsp（view.jsp），並從第二個jsp（view.jsp）到第三個jsp PDF2.jsp）。

PDF2.jsp

<body> 
<form> 
<% 
String cat=request.getParameter("category"); 
System.out.println("It is" +cat); 
%> 
</form> 
</body>

來源

2015-10-06 FIFA oneterahertz

一種選擇是將其存儲在隱藏的價值。 –

可以將它存儲在會話變量 – charlietfl

@charlietfl是的，它可以存儲在會話變量。現在我也意識到 –

purchase.jsp

<form action="view.jsp" method="post"> 
<select name="category"> 
<option value=""> Make a selection </option> 
<option value="company">company</option> 
<option value="institution">institution</option> 
<option value="hospital">hospital</option> 
<option value="Others">Others</option> 
</select> 

<input type="submit" value="Submit"/> 

</form>

view.jsp的

<script type="text/javascript"> 

    function setAction(nPage){ 

     document.forms[0].action = nPage; 
    } 
</script> 
<form> 
<% 
String category=request.getParameter("category"); 
session.setAttribute("cat",category); 
%> 
<select onchange="setAction(this.value)"> 
<option value=''> Make a selection </option> 
<option value='PDF2.jsp'> PDF</option> 
<option value='XLS2.jsp'> XLS </option> 
<option value='DOC.jsp'> DOC </option> 
<option value='XLSX2.jsp'> XLSX </option> 
</select> 
<br/> 

<input type="submit" value="Submit"> 
</form>

PDF2.jsp

<body> 
<% 
Connection conn = null; 

try 
{ 
    Class.forName("com.mysql.jdbc.Driver"); 
    conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/marketing_database","root","root"); 
    String jrxmlFile ="D:/dev/tools/jasper files/report10.jrxml"; 
    InputStream input = new FileInputStream(new File(jrxmlFile)); 
    JasperDesign jasperDesign = JRXmlLoader.load(input); 

    System.out.println("Compiling Report Designs"); 
    JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign); 

    System.out.println("Creating JasperPrint Object"); 
    Map parameters = new HashMap(); 
    parameters.put("category",session.getAttribute("cat")); 
    JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport,parameters,conn); 
    byte bytes[] = new byte[10000]; 
    JRPdfExporter exporter = new JRPdfExporter(); 
    ByteArrayOutputStream PDFStream = new ByteArrayOutputStream(); 
    exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint); 
    exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, PDFStream); 
    exporter.exportReport(); 
    System.out.println("Size of byte array:"+PDFStream.size()); 
    bytes = PDFStream.toByteArray(); 
    response.setContentType("application/pdf"); 
    System.out.println("After JasperPrint = 1"); 
    response.setContentLength(bytes.length); 
    System.out.println("After JasperPrint = 2"); 
    PDFStream.close(); 
    System.out.println("After JasperPrint = 3"); 

    OutputStream outputStream = response.getOutputStream(); 
    System.out.println("After JasperPrint = 4"); 
    outputStream.write(bytes, 0, bytes.length); 
    outputStream.flush(); 
    outputStream.close(); 

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

%> 
</body>

來源

2015-10-06 05:49:32

在view.jsp的，將它設置成會議這樣

<% 
session.setAttribute("category",category); 
%>

您可以檢索它在任何其他JSP這樣

String company= (String)session.getAttribute("category");

來源

2015-10-06 06:01:03

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