java - 我可以将整数值附加到 stringbuilder 吗？

Question

我写了一个 Controller 在后面

 @RequestMapping(value = "/update/{roleId}", method = {RequestMethod.POST, RequestMethod.PUT})
 public String updateRole(@PathVariable Integer roleId,@Valid UserRoleResource roleDTO,  
 ModelMap  modelMap) {
    UserRole userRoleforduplicate = userRoleService.findByRoleName(roleDTO.getRoleName());

    if(userRoleforduplicate==null)
    {
        UserRole userRole =   
    mapper.updateUserRoleFrom(roleDTO,userRoleService.findById(roleId));    
        userRoleService.update(userRole);
        modelMap.addAttribute("user_role", userRole);
        modelMap.addAttribute("roleId", userRole.getRoleId());
        this.succes="redirect:/roles/listroles";
    }
    else
    {
        Object s="Role Name Already Exist";
        modelMap.addAttribute("aslam", s);
        this.succes="redirect:/roles/updateLoadDetails/roleId";     
        }
    return succes;
}

其中else部分没有正常工作，因为变量succes是字符串，roleId是Integer，所以抛出如下错误

 Failed to convert value of type 'java.lang.String' to required type 'java.lang.Integer'; nested  
 exception is java.lang.NumberFormatException: For input string: "roleId"

对于这个问题，我可以将 roleId 附加到 StringBuilder 吗？喜欢

 String s1="redirect:/roles/updateLoadDetails/";
 Integer i2=roleId;
 stringbuilder.append(s1); 
 stringbuilder.append(i2);
 return stringbuilder; 

或者任何其他将整数值传递给字符串的选项？请任何人帮忙

Answer 1

代替下面的代码

String s1="redirect:/roles/updateLoadDetails/";
 Integer i2=roleId;
 stringbuilder.append(s1); 
 stringbuilder.append(i2);

你也可以使用这个，这样代码行会更少

stringbuilder.append("redirect:/roles/updateLoadDetails/").appnd(""+roleId);