服務器端的輸入校驗包含兩種方式：硬編碼方式和配置文件方式。本文演示硬編碼方式中使用validate()方法進行輸入校驗。
1、項目目錄結構：
2、項目核心代碼：
BookAction.java：
public class BookAction extends ActionSupport {
private Book book;
public Book getBook() {
return book;
}
public void setBook(Book book) {
this.book = book;
}
public String execute() {
return SUCCESS;
}
public void validate() {
if (book.getBookName().isEmpty()) {
addFieldError("book.bookName", "書名不能為空！");
}
if (book.getBookPrice()<=0) {
addFieldError("book.bookPrice", "單價不應小於等於0");
}
if (book.getBookPublishDate() == null||book.getBookPublishDate().after(new Date())) {
addFieldError("book.bookPublicDate", "出版日期不能為空並且應該在今天之前！");
}
if (book.getBookCount() <= 0) {
addFieldError("book.bookCount", "數量應大於0");
}
}
}
BookAction.java：
public class Book {
private String bookName;
private double bookPrice;
private Date bookPublishDate;
private int bookCount;
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public Double getBookPrice() {
return bookPrice;
}
public void setBookPrice(Double bookPrice) {
this.bookPrice = bookPrice;
}
public Date getBookPublishDate() {
return bookPublishDate;
}
public void setBookPublishDate(Date bookPublishDate) {
this.bookPublishDate = bookPublishDate;
}
public int getBookCount() {
return bookCount;
}
public void setBookCount(int bookCount) {
this.bookCount = bookCount;
}
}
struts.xml:
<struts>
<package name="default" namespace="/" extends="struts-default">
<action name="addBook" class="com.example.action.BookAction">
<result>/addBook.jsp</result>
<result name="input">/addBook.jsp</result>
</action>
</package>
</struts>
addBook.jsp：
<s:actionerror />
<s:form action="addBook">
<s:textfield name="book.bookName" label="書名" />
<s:textfield name="book.bookPrice" label="單價" />
<s:textfield name="book.bookPublicDate" label="出版日期" />
<s:textfield name="book.bookCount" label="數量" />
<s:submit value="提交" />
<s:reset value="重置" />
</s:form>
3、使用validate()方法校驗結果截圖
