JavaScript中如何调用Java方法

2023-07-16 15:05:03 343

在JavaScript中想要调用Java的方法，我通过JavaScript访问servlet，再通过servlet调用Java某个类的方法。

HTML代码






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"rel="externalnofollow"rel="externalnofollow">
"alt="">



"rel="externalnofollow"rel="externalnofollow"><%=shoes.getBrand()%>/<%=shoes.getSeries()%>/<%=shoes.getName()%>


<%=shoes.getPrice()%>
<%=shoes.getSex()%>/<%=shoes.getSize()%>

ShopShoesDao.java

publicvoiddeleteFromCart(Stringshoes_id){
System.out.println("ShopShoesDao.deleteFromCart");
String[]shoes_ids=shoes_id.split(",");

Connectionconnection=DBUtil.getConnection();
PreparedStatementpreparedStatement=null;

try{
for(Stringstring:shoes_ids){
intid=Integer.parseInt(string);
Stringsql="deletefromuser_product_cartwhereshoes_id=?";
preparedStatement=connection.prepareStatement(sql);
preparedStatement.setInt(1,id);
preparedStatement.executeUpdate();
}
}catch(SQLExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}finally{
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}

ShopServlet.java

protectedvoidservice(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{
//TODOAuto-generatedmethodstub
System.out.println("service");
request.setCharacterEncoding("UTF-8");
Stringmethod=request.getParameter("method");
System.out.println(method);
if(method.equals("addProduct")){
addProduct(request,response);
}elseif(method.equals("getShopsShoesImage")){
try{
getShopsShoesImage(request,response);
}catch(SQLExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}elseif(method.equals("addToCart")){
try{
addToCart(request,response);
}catch(SQLExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}elseif(method.equals("deleteFromCart")){
try{
deleteFromCart(request,response);
}catch(SQLExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}elseif(method.equals("payFromCart")){
try{
payFromCart(request,response);
}catch(SQLExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}
privatevoiddeleteFromCart(HttpServletRequestrequest,HttpServletResponseresponse)throwsIOException,SQLException{
//TODOAuto-generatedmethodstub
System.out.println("deleteFromCart");
request.setCharacterEncoding("UTF-8");
intuser_id=Integer.parseInt(request.getParameter("user_id"));
System.out.println(user_id);
Stringshoes_id=request.getParameter("shoes_id");
System.out.println(shoes_id);
ShopShoesDaoshopShoesDao=newShopShoesDao();
shopShoesDao.deleteFromCart(shoes_id);
request.getSession().setAttribute("shoes_id",shoes_id);
response.sendRedirect(request.getContextPath()+"/cart.jsp");
}

javascrip代码

//点击全部删除
deleteAll.onclick=function(){
if(selectedTotal.innerHTML!=0){
varcon=confirm('确定删除所选商品吗？');//弹出确认框
if(con){
varshoes_id='';
for(vari=0;i
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JavaScript中如何调用Java方法

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