关于数据乱码问题

这个是个让人头疼的问题，在Java Web已经被折磨得体无完肤了，这里还有；这个使用spring自带的过滤器就可以解决了；

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<filter>
    <filter-name>springFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>utf-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>springFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

与我们自己写的不同，这个我们是要配置一下他的编码；

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<init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
</init-param>

说到底，这个过滤器就只有三个属性；

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public class CharacterEncodingFilter extends OncePerRequestFilter {
    @Nullable
    private String encoding;
    private boolean forceRequestEncoding;
    private boolean forceResponseEncoding;

    public CharacterEncodingFilter() {
        this.forceRequestEncoding = false;
        this.forceResponseEncoding = false;
    }

    public CharacterEncodingFilter(String encoding) {
        this(encoding, false);
    }

    public CharacterEncodingFilter(String encoding, boolean forceEncoding) {
        this(encoding, forceEncoding, forceEncoding);
    }

    public CharacterEncodingFilter(String encoding, boolean forceRequestEncoding, boolean forceResponseEncoding) {
        this.forceRequestEncoding = false;
        this.forceResponseEncoding = false;
        Assert.hasLength(encoding, "Encoding must not be empty");
        this.encoding = encoding;
        this.forceRequestEncoding = forceRequestEncoding;
        this.forceResponseEncoding = forceResponseEncoding;
    }

    public void setEncoding(@Nullable String encoding) {
        this.encoding = encoding;
    }

    @Nullable
    public String getEncoding() {
        return this.encoding;
    }

  
    public void setForceRequestEncoding(boolean forceRequestEncoding) {
        this.forceRequestEncoding = forceRequestEncoding;
    }

    public boolean isForceRequestEncoding() {
        return this.forceRequestEncoding;
    }

    public void setForceResponseEncoding(boolean forceResponseEncoding) {
        this.forceResponseEncoding = forceResponseEncoding;
    }

    public boolean isForceResponseEncoding() {
        return this.forceResponseEncoding;
    }

    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        String encoding = this.getEncoding();
        if (encoding != null) {
            if (this.isForceRequestEncoding() || request.getCharacterEncoding() == null) {
                request.setCharacterEncoding(encoding);
            }

            if (this.isForceResponseEncoding()) {
                response.setCharacterEncoding(encoding);
            }
        }

        filterChain.doFilter(request, response);
    }
}

配置ForceEncoding的目的：

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public void setForceEncoding(boolean forceEncoding) {
      this.forceRequestEncoding = forceEncoding;
      this.forceResponseEncoding = forceEncoding;
  }

看了一下这个就是一般的过滤器；

还有一点，就是url-pattern*里面写的是/**的话它可以连着jsp也一起过滤；