js端：

window.open("demoExcel.jsp?columnName="+encodeURI(encodeURI(columnName))+"&columnWidth="+columnWidth+"&resultSetType="+resultSetType+"&columnSum="+columnSum+"&mainHeader="+encodeURI(encodeURI(mainHeader))+"&subHeader="+encodeURI(encodeURI(subHeader))+"&sql="+sql+"&bw="

java端：

 String subHeader = URLDecoder.decode(request.getParameter("subHeader"),"utf-8");

Js传值java后台？保存报错的解决方法